Police: An unknown woman grabs Lt. Philip Chan and assists in pulling him to the ground, while an unknown man pulls Chan and hits him in the back of the left shoulder. (Credit: NYPD/CBS2)

NEW YORK (CBSNewYork/AP) — Police said Monday that there are six more suspects being sought in an attack on two NYPD lieutenants during a protest at the Brooklyn Bridge this past Saturday.

As 1010 WINS’ Roger Stern reported, Manhattan NYPD Chief of Detectives William Aubry said after looking at YouTube videos and talking with witnesses, they have determined that six people besides a Baruch College professor already under arrest attacked NYPD lieutenants Philip Chan and Patrick Sullivan.

PHOTOS: Suspects In Attack On NYPD Lieutenants

As CBS2’s Matt Kozar reported, investigators said a video posted to YouTube shows the two lieutenants attempting to arrest the Baruch professor — Eric Linsker, 29 — who police said tried to throw a metal garbage can at officers.

But Linsker’s entourage allegedly intervened, and Aubry said the YouTube videos show a crowd on a rampage, WCBS 880’s Jim Smith reported. After one minute of scuffling, protesters allegedly pulled the lieutenants to the ground where they kicked and punched them.

“It’s a two-minute period that goes by where there’s individuals that are punching and kicking the two lieutenants,” Aubry said.

Lieutenant Chan suffered a broken nose, police said.

Linsker, of Crown Heights, was arrested shortly before 4 a.m. Sunday. He was charged with assault in the second degree, rioting in the first degree, criminal possession of a weapon, resisting arrest and unlawful possession of marijuana.