AN INVESTIGATION is underway to determine the cause of a suspected gas explosion.

The blast occurred at approximately 1:30am this morning in Stevenage town centre. Police were quick to arrive and section off the area.

Joe Davies, 19, witnessed the explosion whilst walking home from the train station. Mr Davies said: β€œIt completely took me by surprise. The pavement seemed to burst apart and a flame about five feet high blew right in front of me.”

UK Power Networks completed repair work on the site at 7:30am and the area has been sectioned off temporarily.