Hours after a shooting incident at the White House Correspondents Dinner forced an emergency evacuation of U.S. President Donald Trump, an event volunteer has made startling claims about the security arrangements at the venue. According to the volunteer witness Helen Mabus, the suspected gunman Cole Allen had quietly entered a lightly monitored, makeshift room near a terrace-level entrance inside the Washington Hilton hotel. There, he allegedly assembled a “long weapon” from parts taken out of a bag before moving toward the main event space.