Update 9/7/12 8:41 a.m.: Though Christopher Shell, the target of Thursday's US Airways security hoax, was cleared of any wrongdoing, he ended up being arrested anyway on outstanding warrants when he arrived in Dallas-Fort Worth, the Associated Press reports.

Dallas-Fort Worth International Airport spokesman David Magana told the AP that the warrants are from North Texas law enforcement agencies, but he would not comment further.

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Update 9/6/12 2:38 p.m.: In an interview with NBC 10 Philadelphia, Christopher Shell's sister, Kristie Kirland Mangrum, confirmed that it was Shell who was the target of a security hoax that grounded a US Airways flight Thursday morning.

She told the station that Shell called to tell her that his flight was delayed and that he was surrounded by FBI agents. He was described as "nervous, scared and in awe."

Shell has since been re-booked on another flight to Dallas-Fort Worth, where he was headed to celebrate his 29th birthday with family.

ABC 6 Philadelphia is now reporting that the prank call was made by an ex-girlfriend of Shell's.

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Previously 9/6/12 12:35 p.m.: A US Airways flight en route from Philadelphia to Dallas was forced back to Philadelphia Thursday morning after a security scare, reports ABC 6 Philadelphia.

According to ABC, authorities received a call around 7:30 a.m. "stating that a specific individual would attempt to get past TSA and board a flight to somewhere in Texas with a dangerous and hazardous substance."

Once it was confirmed that the man, identified by NBC 5 Dallas-Fort Worth as Christopher Shell, was on the plane, it was forced to turn around. Upon arrival, reports the Philadelphia Inquirer, the plane was parked in a remote location on the runway and the suspect was shown by security cameras outside the plane, on his knees in handcuffs, while being sniffed by dogs.

No explosives were found.

ABC reports that Philadelphia Police Chief Inspector Joe Sullivan told the press that "there was no emergency. There was a threat, but that threat was unfounded...That flight was never in any danger. And I just want to stress right now that the male that was briefly taken in for investigation has committed no crime. It would appear at this time, this is an ongoing investigation, but at this time all indications are that this was a hoax."

According to the Philadelphia Inquirer, Sullivan did not comment on reports that the incident arose from a post made on Facebook, nor would he comment on any details surrounding the caller.

If caught, the caller could face federal charges.