A traffic policeman examines an accident site in Yizhang County, central China's Hunan Province, June 26, 2016. A fire that reduced a tour bus into charred frames on Sunday morning has killed at least 35 people, including two children, in Hunan Province, local authorities said. The accident happened at about 10:20 a.m., when the bus crashed into the guardrail on a highway in Yizhang. (Xinhua/Long Hongtao)

CHANGSHA, June 27 -- The identities of the 35 victims in a fatal bus fire in central China's Hunan Province on Sunday are being verified, local authorities said Monday afternoon.

The incident happened at about 10:20 a.m., when a bus carrying 57 people crashed into the guardrail on a highway in Yizhang County. An ensuing oil leak caused the fire, according to the local government.

The blaze killed 35 people, including two children. Thirteen people were hospitalized and two suffered serious burns.

Six who were seriously injured are receiving treatment in the No.1 People's Hospital of Chenzhou City, while seven who sustained minor injuries are hospitalized in Yizhang people's hospital, said Xiao Zhihong, head of the Yizhang hospital.

Blood samples of victims' relatives are being collected to help identification, authorities said.