(File photo)

On the morning of Feb. 15, 2016, Mr. Song, 81, experienced a suspicious car accident in Qishi town, Yang county of southwest China's Shaanxi province.

His electric bike was hit by a car when he took his nephew Zhou, 59, to the bus station. Song was in a hurry to go home to look for help after seeing his nephew fell into a coma. When he came back, he was shocked to see that his nephew was moved to another place about 300 meters away from the site and turned into a charred corpse.

According to the local villagers, there is still a 300-meter-long bloodstain with the shape of tyre on the ground. "I went out of home at 7 a.m. and saw the firelight in the roadside. I saw the body of a person was burned beyond recognition after I walked close to the site," said a local villager.

Zhou celebrated the Spring Festival at Song's home two days ago. The tragedy happened on the way when he came back to home.

"When I left him, my nephew was only in coma. But he was burned when I came back. I could not imagine who was so cruel to do such a thing," said Song.

Local police have launched an investigation into the accident.