WATCH: Trump takes cover at rally, rushed off stage | LiveNOW from FOX

Former President Donald Trump's rally is on hold, after "popping noises" sounded off mid-speech. Trump hits the ground, and is escorted away from his event in Butler, PA. It's unclear what the sound was, or if there is any danger. Some photos of the event show former President Trump bleeding from the head area.

This is a developing situation.

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