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If it's the shooter then the pops we heard may have been Secret Service weapons.
Others injured. The shots continued. No SS return fire instantly, into a crowd.
I wonder.. it must have been a small arms weapon?
2 July updated 3 July: Daily Mail UK:
BBC presenter David Aaronovitch tweets ‘if I was Biden I’d hurry up and have Trump murdered’ after US Supreme Court ruling - before deleting ‘satirical’ post amid backlash
by Richard Percival