Obama: Americans stand with OK for 'as long as it takes'

WASHINGTON (CNN) -- Describing the tornado that swept across Oklahoma plains as "one of the most destructive storms in history," President Barack Obama said Tuesday the state "needs to get everything it needs right away" to recover from the devastating twister.The president, speaking from the State Dining Room at the White House, said he doesn't yet know the "full extent" of the damage or the "human and economic losses that may have occurred."Dozens of people - including several children - were killed when the massive tornado struck an area outside Oklahoma City on Monday afternoon, officials said.At least seven of the children killed were at Plaza Towers Elementary School in Moore, Oklahoma, according to a police official.While the total magnitude of the storm's damage is unknown, the president pledged the country's resources as the community seeks to rebuild."The people of Moore, should know that their country will remain on the ground, there for them, beside them, as long as it takes," he said. "There are empty spaces where there used to be living rooms and bedrooms and classrooms and in time we're going to need to refill those spaces with love and laughter and community."Obama signed a disaster declaration for Oklahoma late Monday night, ordering federal aid to supplement state and local recovery efforts.