The family of the two Dalit children who were burnt alive in a Haryana village, near Delhi, following an attack by upper caste assailants, have cremated them.

The Central Bureau of Investigation has now been assigned the probe into the case.

"The Haryana government has ordered a CBI probe into the incident," Amit Arya, media adviser to Haryana Chief Minister Manohar Lal Khattar, told the media in Chandigarh.

Congress vice president Rahul Gandhi, who visited the victim's family in Faridabad on Wednesday, accused Haryana's BJP government of failing to ensure security for the weaker sections.

Gandhi also said that the arson attack was a result of "saffron policies".

The Haryana government had failed on the law and order front and "atrocities" on Dalits were on the rise, he said in Sunped village in this district that borders Delhi.

"This is not a government of the weak," said Gandhi. "This is an attitude shared by the prime minister, the chief minister and the BJP-RSS. If somebody is weak, they can be crushed."

Gandhi visited the village and met Jitender, whose house was set on fire by a group of upper caste people after throwing petrol from an open window.

Jitender's wife Rekha, four-year-old son Vaibhav and eight-month-old daughter Divya received burn injuries. Both children succumbed to their injuries. The wife is battling for life in a hospital.

Earlier on Wednesday, protesters blocked the Faridabad-Mathura road at Kaili village near Ballabgarh by placing the children's bodies on the road. They demanded the immediate arrest of all 11 people named in the police complaint and a government job for Jitender.

The state government has suspended eight policemen, including the chief of Sadar police station, and those deputed to guard Sunped village. Police officials said that four arrests have been made in the case.

Besides Gandhi, Communist Party of India-Marxist leader Brinda Karat, former union minister Kumari Selja, Haryana Janhit Congress (Bhajan Lal) leader Kuldeep Bishnoi and National Commission for Scheduled Castes member Ishwar Singh visited the village to meet the bereaved family.