At 9:30AM, Tim Olk tells us that:

The Lyons Fire Department is on the scene of an open 60psi gas feeder line that is burning at 43rd Street and 1St Street. Companies were returning from a fire in Riverside and saw an arcing wire … Bedford Park has a tower ladder on-scene and they are waiting for gas company crews to mitigate the situation.

He submitted these photos

open gas line burns in Lyons 7-19-12

Tim Olk photo

open gas line burns in Lyons 7-19-12

Tim Olk photo

open gas line burns in Lyons 7-19-12

Tim Olk photo