A gas line explosion in Fresno, California, injured 14 people, three who were in critical condition, authorities said Friday.
The cause of the explosion was unknown.
A county road worker was driving a tractor near where the explosion happened, but the worker was not digging at the time of the blast, Fresno County Sheriff’s Office spokesman Tony Botti said.
The gas line exploded near some railroad tracks, in an area where there is a lot of highway construction, Sheriff’s Office Watch Commander John Zanoni said.
The site of the blast backs up against the Sheriff’s Office’s own firing range, Zanoni said.
CNN affiliate KFSN posted a video of the scene that shows a tall ball of fire rising from near a highway.