DENVER, Colorado - September 15, 2011 - Police are asking for the public’s help tracking down a large group of violent teenagers.

They say 10 to 15 young people - described as black or Hispanic and both male and female - attacked four white men on the 16th Street Mall at about 10:45 p.m. on Sunday.

Denver police say the men were standing on the mall near Arapahoe when they were approached by the group. After a conversation, the group turned violent and attacked the men.

Two of the four victims left the scene before they could be questioned. The Denver Post reported that two of the victims suffered minor injuries.

“It’s really unclear as to what their motivation was - why such a large group of young people came together and assaulted these individuals,” said Denver police spokesman Sonny Jackson.

Authorities say the attacks could have been gang related or racially motivated.