The development was confirmed by the Butler County District Attorney in a statement issued following the suspected assassination attempt.
A member of the audience attending the rally has also been confirmed dead, while one other person is believed to be in a critical condition.
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Footage of the incident showed how he abruptly stopped his speech after a shot went off in the air.
Trump appeared to be bleeding from the ear when he was escorted off stage following loud pops that rang out during a rally in Pennsylvania. Business Insider USAHe immediately ducked down as if to evade a projectile while the Secret Service agents quickly swarmed over him to form a human shield.
He then rose and was escorted off the stage by the Secret Service and safely guarded into a waiting black-painted armoured vehicle barely a metre away.
He appeared to be clutching the side of his head as he hit the ground after the gunshot.
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Trump shooter killed by Secret Service
Reports say the Secret Service neutralised the suspected shooter.
“The shooter is no longer a threat," a Secret Service agent can be heard saying before the former President was taken away.
The lone shooter reportedly launched the attack from a low roof outside the perimeter of the rally.
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