MEDFORD, Ore. -

Medford police say a homeless woman charged in three arson cases and the top suspect in several more has been accused of setting a small fire in a public restroom at the county jail.

Lt. Mike Budreau tells the Medford Mail Tribune (http://bit.ly/1tnZsV1 ) surveillance video of the Jackson County Jail lobby shows 57-year-old Debra Irene Johns was in the women's restroom for about 50 minutes last week when the fire was set.

Officers say that a few hours later, they were investigating fire reports at Hawthorne Park when they caught her as she fled while discarding pieces of tissue paper.

She's accused of arson and reckless burning. Police say they're trying to assemble forensic evidence in 19 other fires from the last month. Nobody has been hurt.