Updated: NStar stopped a leak in a high-pressure gas main on Otis Street by 11 a.m. Saturday. The area has now been reopened for residents, and Berberian's Farm stand reopened.

Power did not have to be cut off to the Armeno Coffee Roasters building, said Northborough Fire Capt. Robert Theve.

Original post: Northborough Fire personnel evacuated two houses and two business on Otis Street Saturday morning following a gas main rupture.

A contractor digging a sewer trench for the Wal-Mart expansion struck the high-pressure, natural gas line about 8:14 a.m., said Northborough Fire Chief David Durgin.

The leak was visible at 9:45 a.m., as NStar was preparing to shut off the sources to the line. Two houses in the area were evacuated, as were the Berberian's Farm stand and Armeno Coffee Roasters.

Electrical power was shut off to the coffee business to avoid any chance of ignition, Durgin said.

He could not estimate when the gas leak would be stopped, or a fix completed.

Police are redirecting traffic away from the location.

Northborough Patch will provide updates as they become available.