A Massachusetts gym teacher has been arrested by State Police on child pornography charges.

Stephen McDonough, 60, was arrested and charged with possession of child pornography and dissemination of child pornography. State Police said he worked as a gym teacher at schools in Belmont and Waltham, though they did not specify which schools he worked at.

State Police tipped off

State Police said in late August, the National Center for Missing and Exploited Children contacted them about "suspicious activity online related to child pornography" coming from a home in Waltham where a teacher lived.

Police said they acted with urgency because McDonough is a teacher "in a position of trust with access to children."

In late September, police and members of Homeland Security secured a search warr

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