The Michigan State Police Bomb Squad confirmed that a bomb found by a local diver was not a threat. According to Port Huron Police Sgt. Dave Seghi, the bomb had been found Sunday and the department was notified Monday around 12:30 p.m. The diver, Robert Grattan, who found the item while diving in Lake St. Clair told WGRT he had discovered similar bomb last year, had done the research and knew that it was a training bomb and did not contain explosives. He just wanted to know if it was legal for him to keep at his home. Merchant Street between Grand River Avenue and McMorran Boulevard in Port Huron was blocked off for about 2 ½ hours. The bomb squad x-rayed the bomb and confirmed that it was a training aid that had never been active. Grattan says he believed it was from the World War I era. Police released the bomb back to Grattan.