CHICAGO (CBS)– CTA Blue Line trains were standing at Jackson after a woman was struck by a train, CTA officials reported Friday morning.

According to Chicago police, after reviewing CTA security footage, “it appears that the female victim stepped off the platform and forward onto the tracks.”

Authorities said the reason or motive is under investigation at the time.

Officials said she was transported to a local hospital in critical condition and her condition has been stabilized.

Trains are now running, with delays.

This is a developing story.