A California teenager pleaded guilty Wednesday in a case involving the swatting of a Florida mosque among other institutions and individuals, federal prosecutors said.

Alan Filion, believed to have operated under the handle “Torswats,” admitted to making more than 375 fake threats against schools, places of worship, and government buildings around the United States.

A teen has pleaded guilty to placing hundreds of “swatting” calls across the U.S., the Department of Justice (DOJ) said. The department said Wednesday that Alan W. Filion, 18, of Lancaster, Calif., “pleaded guilty today to four counts of making interstate threats to injure the person of another.