South Dinajpur police have filed a murder case in connection with the Sunday deaths of five members of a family in Jamalpur village.

Police initially suspected farmer Anu Burman, a cancer patient who was finding it tough to arrange money for his treatment, killed his wife, mother and two daughters, and then committed suicide.

But now, “new information” has made the police suspect that the family might have been killed by outsiders. Police found names of three persons written on Anu’s hand and a chopper from a pond next to the house, which might be the murder weapon.

Also, Anu had recently sold some of his land for Rs 3 lakh — apparently for his treatment — and the cash was supposed to be at home, sources said. But cops found neither cash nor around 30 grams of gold that his family was supposed to have at home.

Anu’s cell phone was switched off. “We found that his call list has been deleted,” a police source said.

“We have filed a murder case on Sunday night,” Debarshi Dutta, the SP of South Dinajpur, said. “The house has been sealed. We are getting fingerprint experts to find out whether any outsider had been to the home. Our officers are also waiting for post mortem reports.”