THE BRONX - A powerful earthquake struck Haiti on Tuesday night, likely killing thousands and reducing buildings to rubble.

The 7.0-magnitude earthquake devastated the capital city of Port-au-Prince. The Red Cross estimates that up to 3 million people are affected by the disaster.

Among those missing in the debris are more than 100 employees of the U.N., who are believed to be trapped in the debris of the collapsed U.N. headquarters.

"I have directed my administration to respond with a swift, coordinated and aggressive effort to save lives," President Obama said. "The people of Haiti will have the full support of the United States and the urgent effort to rescue those trapped beneath the rubble - and to deliver the humanitarian relief, the food, water and medicines that the Haitians will need in the coming days."Anyone seeking information on Americans in Haiti can call the U.S. State Department at 1-888-407-4747.