CORRECTS DATE TO SUNDAY, MAY 11, 2008 ** The water tower is one of the few structures left standing in Picher, Okla. on Sunday, May 11, 2008. A tornado roared through Picher Saturday, killing at least seven people, including an infant, and leaving widespread destruction. (AP Photo/Mike Gullett)
Undated (AP) Damage assessments are being conducted in northeast Oklahoma and southwest Missouri, where tornadoes left more than 20 dead.
Officials in Picher, Oklahoma say the town of about 800 might not be rebuilt. Six people were killed and more than 150 injured there by a tornado Saturday night.
Missouri Governor Matt Blunt is expected to survey damage in three southwest Missouri counties where a powerful tornado Saturday night killed 15 people.
Emergency officials say the tornado was approximately 300 yards wide with wind speeds up to 170 miles per hour. They say it was on the ground for about 15 minutes, tearing a 12-mile-long path eastward.