Suspected gunman dies after exchange of fire with Secret Service agents at White House checkpoint

Suspect dies after firing upon agents at White House checkpoint, Secret Service says, with a bystander also injuredA gunman has been shot dead after approaching a White House security checkpoint and firing at officers, federal officials have said.The White House, where Donald Trump was present, was briefly locked down on Saturday as the sound of a sustained volley of gunshots rang out, sending journalists in the are…