A utility says it has stopped the leak from a ruptured well that gushed massive amounts of natural gas near Los Angeles for 16 weeks.

The leak controlled Thursday drove thousands of residents from their Porter Ranch homes and has been blamed for a variety of symptoms including headaches and nausea.

Southern California Gas Co. tried unsuccessfully for weeks to force mud into the well to stop the leak. It had to drill a second well that intercepted the pipe a mile and a half underground.

The well is not permanently sealed, but if the plug holds it will be cemented closed.