For several nights last month, a group of thugs with black hooded sweat shirts pulled tight over their heads, including at least one in “angry” clown makeup, terrorized visitors to Pierce County’s Fort Steilacoom Park, police say.

The group cried “woo, woo, Juggalo” as they assaulted park visitors with a machete and fists. They stole cellphones, cash and wallets and even threatened to cut their victims’ heads off, according to court documents.

So far, two men and a woman have been charged with robbery and assault for their alleged roles in the string of attacks, said Pierce County deputy prosecutor Phil Sorensen. Prosecutors say the suspects claim to be “Juggalos,” a subculture that has developed among the fan base of the rap/metal group Insane Clown Posse.

“The violence was gratuitous,” said Lakewood police Lt. Dave Guttu. “They [victims] had already given up their stuff and were assaulted anyway.”

Two victims suffered broken jaws in the attacks that occurred the nights of June 18-20 and early in the morning of June 21. Another was kicked in the head, and a woman said her attackers demanded that she take off her pants, according to prosecutors.

All of the victims were at the park after it closed, police said.