CHELSEA, MASS. (WHDH) - A replica grenade that was found inside of an apartment building in Chelsea prompted a massive emergency response on Monday.

A Massachusetts State Police bomb squad was called to 266 Revere Beach Parkway around 11 a.m. after the grenade was found during a wellbeing check, according to Chelsea Police Chief Brian Kyes.

The building was evacuated as a precaution.

Potentially explosive black powder and a handgun were also taken from the building, Kyes said. The powder was taken to a marsh in Revere for detonation.

Route 16 was closed for nearly two hours. It has since reopened.

A 70-year-old man who lives in the home will be charged with illegal possession of a handgun.

An investigation is ongoing.

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

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