At least 770 people were evacuated Sunday night after a gas well leakage in southwest China's Yunnan Province, though no casualties were reported, the local government confirmed early on Monday.

The blowout occurred at 7:25 p.m. at a farm in Luliang County, about 150 kilometers east of the provincial capital Kunming, said a spokesman of the county's publicity department.

A drilling company based in the neighboring Sichuan Province was digging for a gas well on the Huaqiao Farm, about five kilometers from Luliang's county seat, when natural gas blew out 15 meters high, the spokesman said.

Emergency measures were taken and residents living within one kilometer to the blowout well were immediately evacuated.

Company sources estimated 90 percent of the blowout was methane and the rest included dust, water and nitrogen.

No fire broke out following the leakage.