A natural gas leak that led to the evacuation of several buildings in San Francisco's Mission District has been capped.

Pacific Gas and Electric Co. crews capped the punctured gas line around 12:30 p.m. Wednesday, a little more than 90 minutes after the leak was reported.

PG&E spokesman Joe Molica said that third-party contractors were doing sewer work in the area when they dropped a rock and damaged the 2 inch main.