Crews unable to pinpoint 'mysterious' odor of gas in Fairfield neighborhood

Fairfield fire and utility crews are unable to locate the source of a mysterious natural gas odor that dozens of residents reported in the northeast section of town Wednesday night.
Fairfield fire officials say they worked with Southern Connecticut Gas to investigate. They say they determined there were no underground gas leaks, stressing the public is safe. 
However, fire officials say they were unable to pinpoint the source of the odor.
They say the smell might have come from a truck, either carrying mercaptan or propane, that may have been leaking as it traveled through the impacted neighborhoods.
Fire officials say the 911 dispatch center received 50 to 100 calls about the smell Wednesday night.