

The path of a powerful tornado is seen in Joplin, Mo., on May 24. A tornado moved through much of the city on May 22, damaging a hospital and hundreds of homes and businesses and killing at least 122 people. Charlie Riedel/AP
This aerial photograph taken on May 24 shows a neighborhood destroyed by a powerful tornado in Joplin, Mo., on May 22. Charlie Riedel/AP
A destroyed apartment complex is seen in Joplin, Mo., on May 24. Charlie Riedel/AP
Josh Ramsey looks through the rubble of what is left of his mother-in-law's home following a tornado, on May 23, in Joplin, Missouri. A massive tornado that tore a six-mile path across southwestern Missouri killed at least 89 people as it smashed the city of Joplin, ripping into a hospital, crushing cars and leaving behind only splintered tree trunks where entire neighborhoods once stood. Jeff Roberson/AP
A sign lays among the ruins after a devastating tornado hit Joplin, Missouri, on May 23. Mike Stone/Reuters
An evacuee sleeps on a cot at a temporary American Red Cross shelter at the Robert Ellis Young Gymnasium at Missouri Southern State University in Joplin, Missouri, on May 23. Mark Schiefelbein/AP
Mark Siler carries some salvageable items from the house of his friend Clay Warden as another storm approaches Joplin, Missouri, on May 23. Warden's house was destroyed the day before by a tornado that hit the southwest Missouri town. Mike Gullett/AP
A man carries a box out of a house damaged by a tornado on May 23, in Joplin, Missouri. Jeff Roberson/AP
Rescue workers walk through a neighborhood destroyed by a tornado, on May 23, in Joplin, Missouri. Jeff Roberson/AP
William Jackson (l.) and Ashley Martin, volunteer firefighters from Oklahoma, survey the wreckage of destroyed homes in Joplin, Mo., on May 22. At least 89 people have died in a monster tornado that left a path of destruction nearly a mile wide through the heart of Joplin. Mark Schiefelbein/AP
Residents begin digging through the rubble of their home after it was destroyed by a tornado that hit Joplin, Mo. on May 22. The tornado tore a path a mile wide and four miles long, destroying homes and businesses. Mike Gullett/AP
Residents of Joplin, Mo., walk west on 26th Street near Maiden Lane after a tornado hit the southwest Missouri city on May 22. Mike Gullett/AP
People walk through a demolished neighborhood the day after a devastating tornado hit Joplin, Mo., on May 23. Mike Stone/Reuters
Mark Langford sorts through debris looking for personal belongings on May 23 after his home was destroyed when a tornado hit Joplin, Mo., on May 22. Mike Stone/Reuters
On May 23, blocks of homes lie in total destruction after a tornado hit Joplin, Mo., on May 22. The death toll is expected to climb as one of the deadliest tornadoes in state history roared through the small Midwestern city, local officials said. Mike Stone/Reuters
Delma Boyd of Joplin, Mo. (r.) talks with medical technician Angela O'Leary in a temporary American Red Cross shelter at the Robert Ellis Young Gymnasium at Missouri Southern State University in Joplin, Mo., on May 23. Ms. Boyd was staying in the shelter after her home was heavily damaged by a tornado. Mark Schiefelbein/AP
Damaged vehicles litter the parking lot of St. John's Hospital in Joplin, Mo., after a tornado hit on May 22. A massive tornado blasted its way across southwestern Missouri on Sunday, flattening several blocks of homes and businesses in Joplin and leaving residents frantically scrambling through the wreckage. Mike Gullett/AP
On May 23, Evelyn Knoblauch sorts through the personal belongings of one of her children after their home was damaged when a devastating tornado hit Joplin, Mo., on May 22. Mike Stone/Reuters
An emergency worker searches a Walmart store that was severely damaged by a tornado in Joplin, Mo., on May 22. Charlie Riedel/AP
Blocks of homes destroyed by a tornado are pictured in Joplin, Mo., on May 23. Mike Stone/Reuters
A cross stands atop a church that was severely damaged by a tornado in Joplin, Mo., as a severe storm passes overhead on May 23. Charlie Riedel/AP