Firefighters douse a forest fire in Lufeng County of Chuxiong Yi Autonomous Prefecture, southwest China's Yunnan Province, March 9, 2014. A forest fire breaking out from Lufeng County of Chuxiong Prefecture at 16:08 Saturday has quickly spread to the Fumin County of Kunming City, covering an area of some 70 hectares, the cause of which is under investigation. A total of 2320 people were mobilized to extinguish the fire. (Xinhua/Gong Yan)

Firefighters are battling to extinguish a forest fire in southwest China's Yunnan Province on Sunday, according to the provincial forest fire team.

A total of 2,320 people, including 250 forest policemen, have been mobilized to put out the blaze, which started at about 4:40 p.m. on Saturday near Qingshan Village of Lufeng County.

An initial evaluation showed that the fire has raged through an area of about 70 hectares with a firebreak extending about 4,000 meters. No casualties have been reported so far.

Local authorities are investigating the cause of the fire.