They sent another threat about a shooting planned for Norwood High School, as well, authorities said. Norwood police upped security at the schools on Friday as detectives searched for the sender.

A 12-year-old has been arrested in connection to a threat about a mass shooting at a middle school in Norwood, Massachusetts ... to the effect that Norwood High School was next.

Schools across Massachusetts announced closures or early dismissals in anticipation of Thursday's snow and sleet storm.

Some school districts in Massachusetts and New Hampshire are closed on Thursday because of a snow and ice storm.