A natural gas leak is being blamed for the explosion that sent 14 workers to the hospital and felt blocks away. Three of them are in critical condition. The explosion occurred in San Diego at a Hilton Hotel under construction and was centered in the fifth-floor utility room. Four other floors sustained extensive damage.

Some of those injured were able to get out on their own, but others needed aid from emergency crews. The injured workers suffered bumps and bruises, cuts, scrapes and burns. A firefighter was also treated on the scene for a finger injury.

The San Diego bomb squad and search-dog teams were called to the scene to help determine the cause. The federal Bureau of Alcohol, Tobacco, Firearms, and Explosives was also on scene to gather evidence. While authorities know the gas came in contact with an ignition source, they are still trying to determine if that source was something electrical, or even from the boilers turning on.

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