UPDATE | Ten dead following Boksburg gas tanker explosion

JOHANNESBURG - At least ten people have died after a gas tanker exploded under a bridge in Boksburg.

Several others have been injured.

The fire gutted several cars and damaged the casualty ward at OR Tambo Memorial Hospital.

It's believed the driver was trying to get through a low bridge and got stuck. 

READ: Gas tanker blast leaves several dead in Boksburg

"There was an explosion that attracted onlookers. Then there were two other explosions," RTMC spokesperson Simon Zwane said.

"The Ekurhuleni fire engine that responded earlier to the fire was blown back and other cars were also affected.

"The hospital casualty ward's ceiling fell down because of the impact of the explosion."

READ: Gas tanker explodes in Boksburg

Zwane said they are gathering information and police will investigate.

An eyewitness said it is a tragedy.

"I heard an explosion followed by another two explosions. We saw the smoke coming from the bridge," he said.

"I was trying to get people away."