The whereabouts of 30 firefighters are unknown in a forest fire in southwest China's Sichuan Province after they went missing on Sunday.

Firefighters of the Liangshan Forest Fire Brigade were fighting the fire on March 27. (Photo: VCG)

The blaze broke out in Lier Village, Yalongjiang Town, Muli County, Liangshan Prefecture, Sichuan Province at 6pm on March 30.

The fire started at a height of about 3,800 meters and the terrain was complex, causing traffic and communication problems.

Prefecture and county level governments immediately launched an emergency plan, sending 689 people to fight the fire.

Changes in wind direction caused another fire as firefighters were on their way to another fire spot on Sunday afternoon, which led to the 30 missing firefighters.