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The Federal Bureau of Investigation of US has identified 20-year-old Thomas Matthew Crooks as the "subject involved" in the attempted assassination of former President Donald Trump, it said in a statement on Sunday.
Crooks, who was from Bethel Park, Pennsylvania, was registered as a Republican, according to the state's voter records.
The Federal Aviation Administration said on Sunday that the airspace over Bethel Park was closed "effective immediately" for special security reasons.