At least 18 killed as tornadoes strike south-central US

A damaged vehicle is seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS 
A damaged vehicle is seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS 
A damaged home is seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
A damaged home is seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
A damaged home is seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
A damaged home is seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
A damaged vehicle is seen amid debris after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
A damaged vehicle is seen amid debris after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
Debris hangs from a tree after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
Debris hangs from a tree after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
First In Video news video photographer Brad Mack covers the damage seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
First In Video news video photographer Brad Mack covers the damage seen after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
Debris is seen at a damaged business after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
Debris is seen at a damaged business after a tornado hit the town of Mayflower, Arkansas around 7:30 pm CST, late on April 27, 2014. -- PHOTO: REUTERS
A flipped pickup truck is reflected in water after a tornado destroyed the town of Mayflower, Arkansas on April 27, 2014. Tornadoes ripped through the south-central United States on Sunday, April 27, 2014, killing at least 12 people in Arkansas
A flipped pickup truck is reflected in water after a tornado destroyed the town of Mayflower, Arkansas on April 27, 2014. Tornadoes ripped through the south-central United States on Sunday, April 27, 2014, killing at least 12 people in Arkansas and Oklahoma and wiping out entire neighbourhoods of homes, according to officials, as rescue workers searched in darkness for survivors. -- PHOTO: REUTERS

WASHINGTON (AFP) - Powerful tornadoes killed at least 18 people as they flipped cars, ripped up homes and uprooted trees across south-central United States, emergency officials reported on Monday.

Rescuers worked through the night using searchlights in blacked-out areas as they sifted through mountains of rubble searching for survivors. Forecasters warned the twisters would continue to threaten much of the region through Tuesday.

The Arkansas Department of Emergency Management said that 15 people were killed when tornadoes touched down on Sunday, while an official with the Oklahoma Emergency Management Agency said there were at least two tornado victims in the state. Local media reported another fatality in the state of Iowa.

In Manila, President Barack Obama, who is on a tour of Asian nations, offered condolences and promised federal government aid. "I want everybody to know that your country will be there to help you recover and rebuild as long as it takes," he said.

"It's chaos right now," the mayor of the Arkansas town of Vilonia, Mr James Firestone, told CNN late on Sunday as emergency crews clawed through the debris overnight in some of the hardest-hit areas.

The central part of the town of 4,000 "seems like it's completely levelled. There's a few buildings partially standing, gas lines spewing. Fire lines down. We've had some casualties", he said. He added that police and firefighters from nearby cities as well as National Guard troops were heading to Vilonia.

Twisters also devastated large sections of the town of Mayflower, with a population of 2,300, just north-west of the Arkansas state capital Little Rock. Pictures of tornado damage posted by Arkansas TV station THV 11 showed big-rig trucks crushed like empty cans, homes violently ripped in half, and whole residential blocks leveled and reduced to rubble.

Officials said that parts of Interstate 40, a major east-west highway across the United States, was closed due to debris and overturned vehicles in the Mayflower area.

Two regional utility companies, Entergy and First Electric Cooperative, said that more than 15,000 customers were in the dark.

Mr Firestone later told CNN that emergency sirens blared some 45 minutes before the tornados struck, warning residents to head to shelters and likely saving lives.

He said Vilonia has seen this before: the town was struck by a tornado that took "almost the same path" three years ago.

Arkansas Governor Mike Beebe wrote on Twitter: "It's been a truly awful night for many families, neighbourhoods and communities, but Arkansans always step up to help each other recover."

In Iowa, the tornado also dumped heavy rain, snapped trees and lifted the roof off a medical centre in the town of Oskaloosa.

In Oklahoma, a powerful twister struck the town of Quapaw. "There have been numerous homes and buildings damaged and some destroyed," Ms Keli Cain of the Oklahoma Emergency Management Agency told AFP. She cited local emergency officials as saying that a fire station was destroyed and there was damage to the northern part of the town.

Dozens of homes were also reported destroyed in nearby Kansas, though state officials have reported no fatalities.

The National Weather Service warned of a severe weather threat across the central and southern United States over the next days.

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