Teachers in Revere, Massachusetts, are sounding the alarm about increasing violence throughout the school system. Educators with the Revere Teachers Association packed into City Hall Monday, urging city councilors for additional safety measures.

The head of the public school district in Revere is blasting teachers union leaders for mischaracterizing the school district amid growing concerns of violence in local schools.

A teacher at Revere High School was slashed with a knife while trying to break up a fight between students on Wednesday morning, the Revere Teachers Association said.