A contractor hit a gas service line while operating a snowplow about 2:06 p.m., and fire officials evacuated several shops, the spokeswoman said.
The line was repaired and people were allowed back into the mall about 2:49 p.m., the spokeswoman said.
At about 5:30 p.m., the mall remained open, though two stores and one mall entrance near Saks Fifth Avenue were closed. Shoppers roamed through the mall, some saying they detected a hint of natural gas remaining in the air.
A Suffolk County police spokesman said no injuries were reported.