From a Washingtonian magazine story by John Pekkanen published in August 1980 and headlined “The Saving of the President”:

About 2:30 PM on Monday, March 30, President Ronald Reagan walked out of the VIP entrance of the Washington Hilton Hotel after speaking to a labor audience. As a reporter shouted, “Mr. President, Mr. President,” a series of shots, sounding like firecrackers, were fired. Secret Service agent Jerry Parr instinctively pushed the President into his waiting limousine, which sped away. As Parr recalled the moment for a Senate subcommittee: