Two helicopters crashed in South Jersey late Sunday morning, authorities said. First responders arrived at the scene, located in Hammonton, to find one of the choppers fully engulfed in flames. The cause of the crash wasn’t immediately clear, and officials were asking residents to steer clear of the area while they clear the wreckage. Federal authorities will investigate the circumstances of the crash. This is a developing story — follow NJ.com for updates. | NJ.com