Cell phone footage showing a group of teens viciously kicking and striking a 16-year-old honors student with splintered railroad ties has ramped up pressure on Chicago officials to address chronic violence that has led to dozens of deaths of city teens each year.

The graphic video of the afternoon melee emerged on local news stations over the weekend, showed the fatal beating of Derrion Albert, a sophomore honor roll student at Christian Fenger Academy High School. His death was the latest addition to a toll that keeps getting higher: More than 30 students were killed last school year, and the city could exceed that number this year.

Prosecutors charged three teenagers on Monday with fatally beating Albert, who was walking to a bus stop when he got caught up in the mob street fighting, authorities said.

The violence stemmed from a shooting early Thursday morning involving two groups of students from different neighborhoods, said Tandra Simonton, a spokeswoman for the Cook County prosecutor's office. When school ended, members of the two groups began fighting near the Agape Community Center.

The attack, captured in part on a bystander's cell phone video, shows Albert being struck on the head by one of several young men wielding wooden planks. After he falls to the ground an appears to try to get up, he is struck again and then kicked.

Prosecutors charged Silvonus Shannon, 19, Eugene Riley, 18, and Eric Carson, 16, with first-degree murder, and they were ordered held without bond on Monday, said Andy Conklin, a spokesman for the Cook County prosecutor's office. The Cook County Public Defender's Office, which represented the three teenagers in court, had no immediate comment Monday.

Chicago police said charges are pending against a fourth suspect and that they are looking for at least three more suspects, but would not discuss a possible motive for the attack.

(Click image above to watch video at eSN.TV)