It started with a baby shower, and ended with four men in a Lawrence, Mass., jail cell being charged with assault with a deadly weapon — their feet.

The four men were arrested after an altercation outside a baby shower, police said.

Surveillance video inside the Lawrence Police Department show the four men attacking another prisoner, and because their hands were tied behind their backs, they could only use their feet.

Police said that because the video did not have audio, they were unsure what started the altercation, though a knife was recovered from the holding room, police said.

The man who was attacked suffered a broken nose but refused treatment.

Click here to watch video report from MyFOXBoston.com