A Portland mom was arrested Thursday after her gun apparently fired by accident in a Northeast Portland elementary school cafeteria while she was picking up her child, police say.

No one was injured in the shooting at Jason Lee Elementary School on Northeast 92nd Avenue. The shooting occurred around 4:35 p.m. and the woman, who hasn't yet been identified by police, was gone with her child by the time officers arrived.

The woman was found in the area and detained. Police have not yet said what charges she faces.

According to a statement from the school sent to parents, the woman had the gun in her bag when one shot was fired.

Investigators are still trying to determine how the handgun went off, police said.

-- Everton Bailey Jr.

ebailey@oregonian.com

503-221-8343; @EvertonBailey