Changsha is the capital of the China’s southern Hunan province and is home to more than 10million people. Dozens of stories of the more than 200 metre building appeared to be alight.
The Chinese broadcaster CCTV said: “Thick smoke is spewing from the site, and several dozen floors are burning ferociously.
“Firefighters have begun work to extinguish the flames and conduct rescues at the scene.”
The building houses an office of the state-owned telecommunications company China Telecom.
State media has reported that the fire had now been put out, but the number of causalities remains unknown.
More to follow.