Crews and search dogs searched through piles of debris in three U.S. states on Sunday, looking for victims of tornadoes and storms that rumbled across the region a day earlier and killed at least 23 people. - In Picher, Okla., a town of 800 and one of the worst-hit communities, seven people died and 150 others were injured. - It's estimated the tornado that struck Saturday afternoon was about 1.5 kilometres across at its peak, with maximum winds of 265 km/h. - A 20-block area was destroyed, emergency officials said. Oklahoma Gov. Brad Henry ordered National Guard troops to arrive on Sunday to help with rescue and recovery efforts. - Residents said the tornado created a surreal scene as it tore through the town, overturning cars, damaging dozens of homes and throwing mattresses and twisted metal high into the canopy of trees. - "I swear I could see cars floating," said Herman Hernandez, 68. "And there was a roar, louder and louder."...