BOSTON (AP) _ A cameraman working on the new ``Ghostbusters'' movie helped police track down a woman accused of shoving an elderly woman to the ground, seriously injuring her.

Authorities said the 72-year-old woman was walking in Boston's Chinatown section Wednesday when she bumped into 24-year-old Tajanetta Downing. Authorities said Downing pushed the woman, who hit her head on the pavement. She was in critical condition Thursday with a life-threatening head injury.

A spokesman for Suffolk County District Attorney Daniel Conley said the cameraman gave police a description that helped officers find Downing.

A judge ordered Downing held on $75,000 cash bail after she was arraigned on assault charges Thursday.

Her attorney did not immediately return a call seeking comment.

The movie, starring Melissa McCarthy, has been filming in Boston since last month.