Three teens have been arrested in one of the two bus robberies that happened in University Village over the weekend.

Police said eight to 15 teens rushed onto two CTA buses without paying around midnight between Saturday and Sunday, beating up riders and stealing electronics from them. One incident happened at 13th Street and Racine Avenue around 11:40 p.m. Saturday; the second happened at Loomis Street and Roosevelt Road around 12:05 a.m. Sunday.

Akeem J. Manago, 18; Christopher Jackson, 17; and a 15-year-old boy were arrested for the incident on Roosevelt. They were charged with felony aggravated battery in a public place and armed robbery. Manago was also charged with felony unlawful use of a weapon and misdemeanor possession of a gun and ammunition without registration.

At a hearing on June 9, a Cook County judge set Manago’s bail at $350,000 and Jackson’s at $250,000. They remain in Cook County Jail awaiting court dates on July 1. The 15 year old was petitioned to Cook County juvenile authorities.

In a news release announcing their arrest, the Chicago Police Department said the investigation was ongoing.

The arrests are symptomatic of a larger problem in the city, as mobs of teenagers have been swarming victims around the city’s downtown, battering them and stealing cash and electronics.

Chicago Police Superintendent Garry McCarthy and Mayor Rahm Emanuel announced Sunday that another 150 police officers have been reassigned to the street from desk duty to deal with crimes like the mob attacks.