BOSTON (WHDH) - Three Boston high schools have been placed in “safe mode” as police investigate the source of a threatening message that was sent to English High School on Wednesday morning, an official said.

A spokesperson for English High School said in a statement that the building was placed in safe mode shortly after 10 a.m. Nearby Madison Park High School and John D. O’Bryant School are also in safe mode.

Classes are continuing as normal but no visitors are being allowed into the buildings.

There will be an additional police presence in the area until further notice.

An investigation is ongoing.

This is a developing news story; stay with 7NEWS for updates online and on-air.

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