A California teenager has admitted to making hundreds of swatting calls - hoax emergency calls - over a two-year period, creating "fear and chaos" when police responded to his false reports of bomb threats and mass shootings at schools,

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 W. Filion, 18, of California, called in false reports of bombings and mass shootings across the country, the authorities said.

A California teenager accused of being a "serial swatter" faces up to 20 years in prison for making interstate threats after pleading guilty in federal court on Wednesday.