The US Secret Service shot dead a suspect who opened fire at a White House checkpoint. A bystander was also shot, news agency Associated Press reported. Journalists working at the White House on Saturday reported hearing a series of gunshots and were told to seek shelter inside the press briefing room. The gunfire Saturday comes nearly a month after what law enforcement authorities said was an attempted assassination of the president on April 25 as he attended the annual White House Correspondents' Association Dinner at a Washington hotel.