A possible mass shooting plot at a Michigan graduation ceremony was thwarted, authorities said, and police are searching for one of the suspects who remains at large. The apparent plot was revealed after authorities responded to a fight that broke out during the Arts and Technology Academy of Pontiac graduation, which was held Tuesday at a business in Pontiac, Oakland County Sheriff Michael Bouchard said. "A person approached our deputies and gave them information that a family member had told them that they had seen on Snapchat a threat to shoot up this graduation ceremony," Bouchard said at a news...