LIVE: ABC Special Report on shooting at Donald Trump rally in Butler, Pennsylvania

Former President Donald Trump was swarmed by Secret Service agents and rushed off stage as possible shots were heard during at a rally in Butler, Pennsylvania, on Saturday.

There appeared to be blood on his right ear as he was being taken off stage, as Trump was seen mouthing "fight" and pumping his fist.

A shooter is dead, Butler County District Attorney Richard A. Goldinger told ABC News.