Here’s what we know about the shooting in Pennsylvania that injured former President Donald Trump on Saturday. 

Where did it happen?

The shooting took place at a presidential campaign rally in Butler, Pennsylvania, a city in the western part of the state about 35 miles north of Pittsburgh. 

What happened?

About six minutes into Trump’s speech, he could be seen clutching his ear after popping noises blared through the rally. Trump ducked to the ground as several Secret Service agents rushed…