A number of houses were flattened by the storms
Federal authorities in the US are sending aid to the three south-central states hit by last weekend's tornadoes which killed at least 22 people.
At least 15 people died in Missouri, six in Oklahoma and one in Georgia. A number of people were also injured.
Officials warn the death toll could rise as rescuers are sifting through the rubble looking for survivors.
President George W Bush called it a "sad day", saying Washington "will be moving hard to help".
The American Red Cross has now opened shelters for those affected by the tornadoes.
'One right after another'
A tornado severely damaged the north-eastern Oklahoma town of Picher late on Saturday, killing at least six people and injuring some 150 people.
Amateur footage of tornado in McAlester, Oklahoma
An emergencies official in Picher said a 24-street area of the town had been "virtually destroyed".
Television images showed overturned cars, homes ripped from their foundations and trees stripped of their leaves.
The storm then hit a rural area near the south-western Missouri town of Seneca and continued east.
At least 15 people died and scores more were injured across the state.
"The last two years we've had floods and tornadoes - it's just one right after another," said Susie Stonner of the State Emergency Management Agency.
In Georgia, one of at least six tornadoes killed a person in Dublin, about 120 miles (193km), south-west of Atlanta.
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