A shooter fired multiple rounds toward the stage at a Saturday campaign rally for former president Donald Trump. Federal officials are investigating the incident as an assassination attempt.Read more:Donald Trump, the former president who is set to formally accept the Republican nomination later this week, was less than 10 minutes into his speech at a rally in Pennsylvania when a burst of gunfire interrupted him. Trump was quickly rushed offstage with what appeared to be blood on one side of his face. He later said in a TruthSocial post that he was shot in his upper right ear. Authorities are investigating the event as an assassination attempt. According to law enforcement, the shooter and one spectator are dead and at least two others are critically injured.National political reporter Isaac Arnsdorf was at the Trump rally in Butler, Pennsylvania and witnessed the shooting unfold. He spoke with host Martine Powers late Saturday night, recounted his experience and shared the latest details of what we know so far. Martine also spoke with Post photographer Jabin Botsford who was a few feet from Trump when the gunfire began and a Trump supporter who attended the rally.Today’s show was produced and mixed by Ted Muldoon, with production assistance from Rennie Svirnovskiy. It was edited by Reena Flores and Renita Jablonski. Subscribe to The Washington Post here.