A mob of unruly teens last night once again wreaked havoc on Center City, assaulting and robbing random pedestrians.

About 9:15 p.m., police began to receive 9-1-1 calls about a group of 20 to 40 teens assaulting people. Police found a man on the ground bleeding badly from the head at Walnut and Juniper streets. He was taken to Thomas Jefferson University Hospital.

Brian Mishico, who was working the door at Good Dog Bar and Restaurant on 15th Street near Locust, said a crowd of about 30 kids, some who looked as young as 12, split into two groups as they walked down 15th Street.

On one side of the street, the marauding youths knocked over a planter at the Aria condominium building. "They just knocked over everything on the street," he said.

On the other side of 15th Street, kids started randomly fighting pedestrians on the sidewalk in front of the Max Brenner restaurant, Mishico said.

"It's crazy, I've never seen anything like it," Mishico said. "It seems totally random."

A patron at Fado, at 15th and Locust, said the group then turned left on Locust heading toward Broad and came upon two men and a woman. They started assaulting the men, then someone grabbed the woman's hair and punched her in the head.

At least five people were arrested.

- Daily News staff report