A juvenile who is an alleged member of a cybercriminal group has been hit with federal charges after they allegedly placed a fake 911 call that led to a large police response at a library on the University of Colorado Boulder campus.

Police, including the Boulder Police Department’s SWAT team, were called in August on reports of shots fired at the university’s Norlin Library, though no such incident was taking place. The call led to a campus-wide shelter-in-place being ordered.

The fake call was an instance of “swatting,” which is when a fake 911 call reporting a serious emergency is placed, often with the intention of sending a heavy police response to the location.

The incident at CU Boulder was one of many targeting universities across the country, according to a news release from the U.S. Department of Justice and CU Boulder. The juvenile charged in the incident, who was not named by authorities, was a “self-identified member” of the cybercriminal organization known as “Purgatory.”

CU Boulder was not specifically targeted, the university said. It is believed the universities were chosen at random. The alleged perpetrator was also never on CU Boulder’s campus.

The university’s police department worked with the FBI to investigate the case. Authorities did not specify what charges the juvenile is facing.