Video released by Massachusetts police on Wednesday shows a woman running down a pervert who flashed her while she was jogging on a road in Cambridge, cops said.

The footage taken on July 18 shows the woman jogging on Memorial Drive near Vassar Street in Cambridge after the man exposes himself and she quickly turns around and darts directly toward him, according to police.

As the woman approaches the man, she attempts to detain him while telling witnesses to call 911.

She grabs him by the wrist, but the man breaks free. He then desperately flails his arms in an attempt to get away.

Finally, the suspect runs off in the opposite direction.

The flasher was described as having dark hair with a receding hairline. He was wearing black and gray running clothes and black running shoes with white soles.