Drivers warned after fatalities on Oklahoma highways

The sight of large vehicles flipped along the state's roadside is testimony to the power of the storms. Credit: REUTERS/Bill Waugh

Oklahoma officials remain worried that drivers stuck on highways could be trapped in the path of dangerous twisters spawned by the violent thunderstorms hitting the US state.

A mother and baby - who are among five confirmed killed by the latest tornado - died when their car was flipped on Interstate 40.

Between 40 to 50 people are being treated for storm-related injuries, health officials have said.

Five patients, including a child, are in critical condition.

Watch: Tornado caught on camera heading for Oklahoma City

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Oklahoma tornadoes kill nine

Powerful tornadoes have struck Oklahoma for the second time in as many weeks and left nine people dead, including a mother and child. Thousands of people have been left without power as the storm caused destruction to properties and vehicles.