Woman standing on top of Oklahoma tornado devastationForty five minutes is all it took for the tornado to obliterate 30 square miles of Oklahoma at 3pm yesterday.

In the worst storm the area has ever seen 91 people have been confirmed dead and at least 190 people injured.

Survivors described clinging on to walls and schoolchildren huddling together under their teachers who bravely tried to protect them.

President Obama has declared Oklahoma a major disaster area as the search is underway for survivors.

To see video clips of the tornado sweeping across the area, click here