The blast was most likely caused by a natural gas leak.
The cause of the gas leak was under investigation yesterday.
"I assume the police looked into the possibility of a gas leak."
They think maybe there's been a gas leak or something.
Officials said the blast was probably caused by a gas leak.
It was the second gas leak at the mill in recent days.
I know what to do to find a gas leak!
The officials said a gas leak was the most likely cause but did not rule out other theories.
Later reports state that the explosion was due to a gas leak.
Others could lead to gas leaks or water damage if they're not done properly.
