KUNMING, Feb. 19 (Xinhua) -- A fire starting in Myanmar has spread across the border to China, raging through forests in two townships and into a protected nature reserve, local forest fire control authorities reported Sunday.

The blaze crossed the border into Yunnan Province in late Saturday afternoon. Two sections of forests -- under the jurisdiction of Lushui City -- are still on fire, the officials said.

A section of Gaoligong Mountain Nature Reserve is being affected.

More than 100 fire fighters were mobilized as they marched into the difficult terrains toward the blaze at about 3,100 meters above sea level.

There is no known habitants in the affected area, according to the officials.

The authorities said they are monitoring the wind change or other favorable weather conditions to put out the blaze.