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


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.