Powerful tornadoes tearing across southern United States have killed at least 10 people, emergency officials in the states of Arkansas and Oklahoma reported

Powerful tornadoes tearing across southern United States have killed at least 10 people, emergency officials in the states of Arkansas and Oklahoma reported late Sunday.
  
The Arkansas Department of Emergency Management said there were eight storm-related fatalities, while an official with the Oklahoma Emergency Management Agency said there were at least two tornado victims in the state.
  
Local emergency crews were combing through the debris in some of the hardest-hit towns as forecasters warned that more twisters were on their way. "It's chaos right now," the mayor of the Arkansas town of Velonia, James Firestone, told CNN.
  
The downtown area "seems like it's completely leveled. There are a few buildings partially standing, gas lines spewing. Fire lines down. We've had some casualties." Firestone said that police and firefighters from nearby cities as well as National Guard troops were heading to his town to help.