Waltham’s 911 center received a call at 10:45 am on November 27th at 43 Foundry Avenue that a construction crew digging struck a pipe surrounded by 10 cannon balls. Waltham Fire dispatched Engine 3 and when they arrived found numerous cannon balls.  In addition, the crews said there may be other devices in the pipe. The Mass State Police bomb squad was requested. They determined there was another devise in the pipe. A hazmat response was activated along with Engine 2 and Sqaud 5 and several medic units. With the help of a back hoe, the bomb squad determined there were more devises in the pipe. The area businesses were then evacuated. The devices were detonated at an offsite location.