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A King County District Court judge today found probable cause to hold Ashley Doretha Vassar for investigation of assault in connection with the stabbing of a woman on a Metro Transit bus Tuesday afternoon.

Vassar, 19, is being held in the King County Jail in lieu of $50,000 bail.

Around 2:45 p.m. Tuesday, Vassar was sitting at the front of a Route 7 bus, across from the driver, with a screwdriver or shank in her hand, according to the probable-cause document outlining the case. Vassar “had an unprovoked emotional outburst on the bus and was crying,” and her behavior caused the driver to believe she may have had a medical condition, such as Tourette’s syndrome, the document says.

As passengers were unloading at the corner of Third Avenue and Pine Street, a female passenger tapped Vassar on the shoulder “to offer some emotional support,” it says. Vassar yelled, “Don’t touch me!” and then stabbed the woman in the chest with the screwdriver or shank, the document says.

The victim approached officers standing near the bus stop and told them what happened while the driver jumped out and chased Vassar for two blocks until he saw police, it says. Officers arrested Vassar at 1908 Third Ave. “with the screwdriver/shank still in her hand,” the document says.

At least two witnesses told police the attack on the victim was unprovoked, it says. The woman was treated at Harborview Medical Center and later released.