JAIPUR: Four children died when a hut in which they were playing caught fire around 3pm in Kalaron Ki Dhani in Sardarshahar of Churu district on Tuesday. The cause of fire is yet to be ascertained.Three children (two brother and their sister) and one cousin sister died in the incident, said Girdhari Lal circle officer , Sardarshahar.The police are investigating into the matter. “We did not find any source of fire. There is no electricity supply in the hut. There was no stove inside the hut,” he said.One Lal Chand, who is uncle of the children died in the incident told police that the children were alone when the incident happened. “In the village, Lal Chand and his brothers have several kuchha houses. At the time of the incident, the elders of the family were not inside the hut, when fire broke out. The villagers rushed to douse the fire, but all efforts went in vain. All the four children charred to death,” said the circle officer.The police said that all the children were less than 6-year-old.