An attack at Chico's Bidwell Park landed five teenagers in juvenile hall.
Police said they robbed a man at knifepoint, and shot video of the whole thing.
It happened around 5 p.m. Monday near Caper Acres playground.
Police said a 20-year-old man was approached by the teens. One allegedly assaulted the victim while another pulled a knife and a third tried to take property from him. Officers said the other two shot video of the attack.
The suspects include three 16-year-old boys and two 15-year-old girls. Officers tracked them down a few minutes later at One Mile Recreation Area. They face armed robbery charges.