WASHINGTON (AFP) - breaking news

Two explosions rocked the side of the Pentagon Tuesday, a witness said.

"I heard two loud booms - one large, one small," said Lisa Burgess, a reporter for Stars and Stripes newspaper.

She said she saw smoke billowing from one side of the building.

Hundreds of people rushed for the exits of the world's largest office building after being ordered to evacuate.

Admiral Craig Quigley, a Pentagon spokesman, was unable to confirm an explosion.

"I'm seeing cops all over the building," he told AFP . ""We're being directed to evacuate the building."