Gunfire has just shattered the security bubble around the White House. A terrifying shootout erupted just meters from the Oval Office on Saturday after an armed gunman opened fire near a security checkpoint. Secret Service agents reacted within seconds, fatally shooting the suspect, identified as 21-year-old Nasire Best. Shocking new details reveal Best had a bizarre online history, claiming he was "the real Osama bin Laden" and posting assassination threats against Donald Trump. While the President was rushed to safety inside the compound, investigators admit this suspect was already well known to police. Watch the terrifying breakdown.