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Jessica Ridgeway, 10, Has Been Missing Since Friday, Police Using Bloodhounds To Help Search

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Sunday marks the third day authorities have been searching for missing Westminster, Colo. 10-year-old Jessica Ridgeway.

Jessica was last seen on Friday, Oct. 5th around 8:30 a.m. making the three-block-walk to Chelsea Park where she usually meets a group of friends to walk to school with, but authorities say she never made it that far.

On Sunday, investigators say they found a backpack and water bottle believed to be Jessica's in the town of Superior, about six miles away from where she was last seen. The water bottle had her name on it and investigators are pursuing leads.

An Amber Alert went out late Friday night and the Westminster Police Department said that the FBI joined search efforts that same night.

One of Colorado's state criteria for issuing an Amber Alert is that the child must be in immediate danger of serious bodily harm or death, though police didn't say there is any indication she was abducted.

However, Westminster Police say that they got a late start searching for Jessica because her mother--who works the graveyard shift--hadn't realized she was missing since she slept through calls made from the school when Jessica didn't show.

Her mother said she arrived home at 7:30 a.m. and last saw Jessica around 8:30 a.m. when she watched her start walking to the park.

The Westminster Police Department has said that it has had over 800 volunteers help look for Jessica on Saturday, have been using bloodhounds, a helicopter, dive teams and contacted Jessica's father who lives in another state.

"At this time we don't have any indication he is involved in any way," Westminster police spokeswoman Cheri Spottke told MSNBC.

Police said dive teams used sonar technology to rule out nearby Ketner Reservoir and found nothing.

On Twitter, police asked people not to conduct their own uncoordinated searches for Jessica because it "disrupts police dogs."

This morning police say they have sent out a new team of bloodhounds that reportedly picked up on a scent Friday, but it may have been older than Friday morning when Jessica disappeared.

Police are monitoring social media sites and tip lines for anyone with any information. Jessica is 4'10," 80 pounds, has shoulder-length blonde hair, blue eyes and was last seen wearing a black jacket with pink and purple eyeglasses. Anyone with any information is being asked to call the Westminster Police tip line: 303-658-4336 or email PDamberalert@cityofwestminster.us.

Follow the Westminster Police on Twitter and Facebook.

This story has been updated to include the finding of Jessica Ridgeway's backpack and water bottle by police on Sunday.