Extreme weather sparks US flash floods

Extreme weather has been wreaking havoc in the US, where storms and tornadoes have caused major flooding in the states of Oklahoma and Texas.

Parts of Houston - the US's fourth biggest city - remain under water.

Thousands of cars have been abandoned on city streets and highways.

Hundreds of residents have been displaced and more than 1,000 homes have been destroyed.

At least 17 people have been killed and dozens injured following record rainfall over the weekend.

More heavy rains are expected over the next few days.