Updated story

Two male prisoners escaped from the Metropolitan Correctional Center in Chicago's South Loop early Tuesday.

The men have been identified as Jose Banks, 37, and Kenneth Conley, 38. NBC Chicago reports the two were last seen Tuesday morning in the Tinley Park, Ill. area, about 25 miles from the Chicago facility.

A search is now underway for the men -- cellmates and both recently convicted bank robbers. Patch reports that the Cook County sheriff's K9 unit was out in Tinley Park early Tuesday afternoon in an unsuccessful attempt to track the duo.

Authorities discovered that the men were missing from their cell around 8:45 a.m., the Chicago Tribune reports. The two had last been checked in on at 5 a.m. at the 71 W. Van Buren federal facility, police said, but were last seen during a physical head count at 10 p.m. Monday.

The men apparently tied bedsheets together to form a rope which they used to climb out of a window, NBC reports. The jail's windows are seven feet tall but only five inches wide, the Chicago Reader notes.

From the Associated Press:

Hours later, what appeared to be a rope, knotted at six-foot intervals, could be seen dangling into an alley on the side of the Metropolitan Correctional Center from a window approximately 20 stories from the ground.

According to ABC Chicago, police said it was not likely the two escaped with weapons, but they are still being considered armed and dangerous. The men could be wearing white t-shirts, grey sweatpants and white gym shoes. Police suspect the men had as much as a nine-hour head start before authorities noticed they were missing.

Banks is the so-called "Secondhand Bandit," according to the Chicago Sun-Times. After he was convicted last week, Banks vowed to the judge, "You'll hear from me!"

Arrest warrants have been issued for Banks and Conley, according to CBS Chicago. Prison escape carries a five year prison term maximum sentence, plus a fine of $250,000.

Anyone who sees the men is being urged to call the FBI's Chicago office at 312-421-6700.

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  • Police and a K9 officer search the Metra station in downtown Tinley Park, Ill. (<a href="http://tinleypark.patch.com/articles/fbi-escaped-bank-robbers-last-seen-in-tinley-park">Via Patch</a>.)

  • Police and a K9 officer search the Metra station in downtown Tinley Park, Ill. (<a href="http://tinleypark.patch.com/articles/fbi-escaped-bank-robbers-last-seen-in-tinley-park">Via Patch</a>.)

  • Television news crews gather outside the home of an unidentified family member of escaped prisoner Kenneth Conley Tuesday, Dec. 18, 2012, in Tinley Park, Ill. Conley and Joseph "Jose" Banks, two convicted bank robbers, escaped from a federal prison window using a knotted rope or bed sheets high above downtown Chicago early Tuesday according to authorities. Authorities are convinced the two men visited the home before law enforcement officers arrived. (AP Photo/Charles Rex Arbogast)

  • Police tape surrounds the Metropolitan Correctional Center Tuesday, Dec. 18, 2012, in Chicago. Two convicted bank robbers used a knotted rope or bed sheets to escape from the federal prison window high above downtown Chicago early Tuesday, a week after one of them made a courtroom vow of retribution, to federal judge. The escape occurred sometime between 5 a.m. and 8:45 a.m. when the inmates were discovered missing, Chicago Police Sgt. Mark Lazarro said. Hours later, what appeared to be a rope, knotted at six-foot intervals, could be seen dangling into an alley from a window of the Metropolitan Correctional Center approximately 20 stories above the ground. (AP Photo/M. Spencer Green)

  • A rope dangles from a window on the back side of the Metropolitan Correctional Center Tuesday, Dec. 18, 2012, in Chicago. Two convicted bank robbers used a knotted rope or bed sheets to escape from the federal prison window high above downtown Chicago early Tuesday, a week after one of them made a courtroom vow of retribution, to federal judge. The escape occurred sometime between 5 a.m. and 8:45 a.m. when the inmates were discovered missing, Chicago Police Sgt. Mark Lazarro said. Hours later, what appeared to be a rope, knotted at six-foot intervals, could be seen dangling into an alley from a window of the Metropolitan Correctional Center approximately 20 stories above the ground. (AP Photo/M. Spencer Green)

  • A harness and the end of a rope dangles from a window on the back side of the Metropolitan Correctional Center Tuesday, Dec. 18, 2012, in Chicago. Two convicted bank robbers used a knotted rope or bed sheets to escape from the federal prison window high above downtown Chicago early Tuesday, a week after one of them made a courtroom vow of retribution, to federal judge. The escape occurred sometime between 5 a.m. and 8:45 a.m. when the inmates were discovered missing, Chicago Police Sgt. Mark Lazarro said. Hours later, what appeared to be a rope, knotted at six-foot intervals, could be seen dangling into an alley from a window of the Metropolitan Correctional Center approximately 20 stories above the ground. (AP Photo/M. Spencer Green)

  • A Chicago police officer stands guard in the lobby of the Metropolitan Correctional Center Tuesday, Dec. 18, 2012, in Chicago. Two convicted bank robbers used a knotted rope or bed sheets to escape from the federal prison window high above downtown Chicago early Tuesday, a week after one of them made a courtroom vow of retribution, to federal judge. The escape occurred sometime between 5 a.m. and 8:45 a.m. when the inmates were discovered missing, Chicago Police Sgt. Mark Lazarro said. Hours later, what appeared to be a rope, knotted at six-foot intervals, could be seen dangling into an alley from a window of the Metropolitan Correctional Center approximately 20 stories above the ground. (AP Photo/M. Spencer Green)

  • Police search for evidence and secure the area around from the federal Metropolitan Correctional Center in the Loop after two convicted bank robbers escaped on December 18, 2012 in Chicago, Illinois. Joseph 'Jose' Banks and Ken Conley appear to have busted away concrete to enlarge a window opening then climbed down about 16 stories on makeshift ropes on the outside of the building. Banks, known as the Second-Hand Bandit, was convicted last week of two bank robberies and two attempted robberies where he made off with a nearly $600,000, $500,000 of which is still unaccounted for. Conley was convicted of robbing nearly $4,000 from a bank last year. (Photo by Scott Olson/Getty Images)

  • Police search for evidence and secure the area around from the federal Metropolitan Correctional Center in the Loop after two convicted bank robbers escaped on December 18, 2012 in Chicago, Illinois. Joseph 'Jose' Banks and Ken Conley appear to have busted away concrete to enlarge a window opening then climbed down about 16 stories on makeshift ropes on the outside of the building. Banks, known as the Second-Hand Bandit, was convicted last week of two bank robberies and two attempted robberies where he made off with a nearly $600,000, $500,000 of which is still unaccounted for. Conley was convicted of robbing nearly $4,000 from a bank last year. (Photo by Scott Olson/Getty Images)

  • Crime scene tape surrounds the federal Metropolitan Correctional Center in the Loop after two convicted bank robbers escaped on December 18, 2012 in Chicago, Illinois. Joseph 'Jose' Banks and Ken Conley appear to have busted away concrete to enlarge a window opening then climbed down about 16 stories on makeshift ropes on the outside of the building. Banks, known as the Second-Hand Bandit, was convicted last week of two bank robberies and two attempted robberies where he made off with a nearly $600,000, $500,000 of which is still unaccounted for. Conley was convicted of robbing nearly $4,000 from a bank last year. (Photo by Scott Olson/Getty Images)

  • The federal Metropolitan Correctional Center where two convicted bank robbers escaped stands in the south end of the Loop on December 18, 2012 in Chicago, Illinois. Joseph 'Jose' Banks and Ken Conley appear to have busted away concrete to enlarge a window opening then climbed down about 16 stories on the makeshift ropes to make their escape. Banks, known as the Second-Hand Bandit, was convicted last week of two bank robberies and two attempted robberies where he made off with a nearly $600,000, $500,000 of which is still unaccounted for. Conley was convicted of robbing nearly $4,000 from a bank last year. (Photo by Scott Olson/Getty Images)

  • Kenneth Conley

    This undated photo provided by the FBI shows , Kenneth Conley one of two inmates who escaped from the Metropolitan Correctional Center in downtown Chicago Tuesday, Dec. 18, 2012. Chicago Police Sgt. Michael Lazarro says their disappearance was discovered at about 8:45 Tuesday morning. Lazarro says the pair used a rope or bed sheets to climb from the building. (AP Photo/FBI)

  • Jose Banks

    This undated photo provided by the FBI shows Jose Banks, one of two inmates who escaped from the Metropolitan Correctional Center in downtown Chicago Tuesday, Dec. 18, 2012. Chicago Police Sgt. Michael Lazarro says their disappearance was discovered at about 8:45 Tuesday morning. Lazarro says the pair used a rope or bed sheets to climb from the building. (AP Photo/FBI)

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  • In this undated surveillance video frame grab released by the FBI showing a bank robber dubbed the "Plain Jane Bandit". The FBI says a Southern California bank robber dubbed the "Plain Jane Bandit" has struck again. The latest heist was Monday July 30,2012 at a Bank of America branch in Downey, Calif. Since July 12, the robber has hit seven banks. (AP Photo/FBI)

  • EDS NOTE: IMAGE WAS ALTERED BY SOURCE - This surveillance image provided by the King County Sheriff's Office shows a man armed with an assault rifle grabbing money while robbing a Chase bank in North Bend, Wash., on July 6, 2012. The FBI says the man is the same suspect who robbed a bank Feb. 29, 2012 in Chino, Calif., during which the robber shot and wounded a police officer., and a March 12 bank robbery in Vacaville, Calif. He is known as the "AK-47 bandit" because he brandished an AK-style assault rifle during the three robberies to which he's linked. (AP Photo/King County Sheriff's Office)

  • Colton Harris-Moore

    FILE - In this Dec. 16, 2011, file photo, Colton Harris-Moore, also known as the "Barefoot Bandit," appears at the Island County Superior Court, in Coupeville, Wash. Harris-Moore, who led police on a two-year crime spree in stolen boats, cars and planes, has been moved out of solitary confinement and into the general inmate population at another prison in Washington state, corrections officials confirmed Thursday, May 3, 2012. (AP Photo/Ted S. Warren, File)

  • This July 15, 2010 security photo provided by the New York Police Department on Monday, July 19, 2010 shows a man police say robbed a bank armed with a bouquet of fresh flowers, in New York. Police say he reached into the arrangement and pulled out a note demanding $100 and $50 bills and warned, "Don't be a hero." He was given an undisclosed amount of cash before fleeing the Bank of Smithtown in the Chelsea neighborhood of Manhattan. (AP Photo/NYPD)

  • In Australia, 'Buxom Bandit' Allegedly Commits Rookie Robbery

    Police in Queensland, Australia are searching for a man and woman accused of holding up a gas station with a knife.

  • Geezer Bandit

    FILE - This Monday, June 7, 2010 file photo provided by the FBI shows a suspect identified as the "Geezer Bandit" robbing a USA Bank branch in Poway, Calif. Authorities say the robber branded "The Geezer Bandit" because he appeared to be old might actually be wearing a mask. FBI spokeswoman Laura Eimiller said Friday the man was seen sprinting across a parking lot after his most recent holdup this month. (AP Photo/FBI)