Breaking news from the Washington Post:
An alarm box near the front entrance of the White House designed to alert guards to an intruder had been muted at what officers believed was a request of the usher’s office, said a Secret Service official who spoke on the condition of anonymity.
The female officer posted inside the front door appeared to be delayed in learning that the intruder, Omar Gonzalez, was about to burst through. Officers are trained that, upon learning of an intruder on the grounds, often through the alarm boxes posted around the property, they must immediately lock the front door.
After barrelling past the guard immediately inside the door, Gonzalez, who was carrying a knife, dashed past the stairway leading a half-flight up to the first family’s living quarters. He then ran into the 80-foot-long East Room, an ornate space often used for receptions or presidential addresses.
Gonzalez was tackled by a counter-assault agent at the far southern end of the East Room.