A woman is in custody after allegedly battering nine people on Chicago’s Northwest Side in a series of assaults, including at least two attacks with a baseball bat, police said.

There were at least six separate attacks, police said. The accounts follow a similar pattern: The attacker pulls up to women walking in Northwest Side neighborhoods, gets out of her white-colored car and batters them with her hands or a baseball bat.

Officers took a woman into custody overnight after video of the alleged attacker battering a mother circulated, police said Wednesday. In the four-second video, the metal ding of the bat rings aloud as the attacker lifts the bat above her head and swings down on a woman shielding an infant in a stroller.

“She was swinging that bat to hurt somebody,” said Shannon Condon, who recorded the brief video and came to aid the victim during the Tuesday morning attack.