UPDATED: Scene Clear at Waltham Building Evacuated for Suspicious Package

UPDATED, 1:24 p.m.: WBZ Radio's Carl Stevens tweeted that a phoned in bomb threat forced the response and evacuation at 200 West St.

UPDATED, 1:17 p.m.: Waltham Police now say all units are clear from the scene. 

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UPDATE, 12:21 p.m.: Waltham Police have confirmed, via Twitter, that they are actively investigating at incident at 200 West St., the home of A123 Systems. They did not specify any details.

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Authorities are evacuating 200 West St. on reports of a suspicious package, according to Twitter reports. 

The first report came in at around 10 a.m. and now the building is being evacuated, according to Twitter reports.