Minute-by-minute break down of how Washington's most glamorous gala descended into night of calamity

Chaos erupted in the heart of the nation's capital last night as the White House Correspondents' Dinner - Washington's most glitzy annual tradition - was shattered by gunfire. What began as a night of high-society networking and political ribbing at the Washington Hilton turned into a harrowing survival scene. A-list celebrities, government officials and media power players were calmly seated in the ballroom when the festive atmosphere was punctured by the sound of a violent security breach.