A masked man is on the loose in Philadelphia after allegedly chasing down and assaulting a woman while wearing a doll mask, police said.

The unidentified man was seen on Wednesday near City Hall and asked one woman if she was "ready to die" while chasing others, police told FOX 29. Police said the man, who was wearing a doll mask, chased a 40-year-old woman and made threatening comments while holding his hand behind his back.

As the woman was trying to run, she fell and injured herself, police said.

Officials said the masked man fled the area and went into a train station afterwards.

Philadelphia police described the man as a Black male between 16 and 20 years old, 5'8" and wearing a "white baby doll-style Halloween mask with black hair, and a black/blue plaid backpack."

Philadelphia Police Captain Jason Smith said, "He was able to accost a good many of people, most of which haven't come forward yet."

The man was seen on surveillance cameras running up to several people, and was refused service at a Dunkin' because of his mask. He left the restaurant after showing erratic behavior.

One of the victims told police she was confronted twice and ran, "screaming for help this entire time." Police say the masked man filmed himself with a cell phone during the incidents.

The suspect will likely be charged with felony terroristic threats, harassment, simple assault and reckless endangerment, police said.