But he added that several witnesses said they smelled gas after the explosion.

I could smell gas that came out under the door.

You may not be able to smell gas if there is a leak.

I smell gas, and we might be risking a fire.

Leave the area if you smell gas or fumes from other chemicals.

"What happens when someone smells gas coming from the apartment, or hears water running - do you break the door down?"

If you smell gas, turn the tank off quickly and call the fire department.

Do not enter a building if you smell gas.

"The secretary told me they were smelling gas recently," she said.

During the days prior to the explosion, some residents reported smelling natural gas in the area.