Police on Thursday got the statements of the brother and maternal uncle of Asif Mohammad, who had allegedly killed his parents, sister and grandmother, recorded before a judicial magistrate.

The investigators said the statement of Asif’s brother, Arif Mohammad, was crucial as he had lodged an FIR against the accused and was present at the time of the alleged murders at Kaliachak in February. “He might be made the principal witness if his statement is found to be instrumental in the interest of the case,” said a source.

Shish Mohammad, Asif’s uncle, is believed to know how Asif had collected firearms and ammunition. “Hence, his statement would cement the case against Asif,” said the source.

After Asif’s arrest, the police seized seven automatic 7mm pistols, nearly 80 bullets and 10 magazines from his friends Sabir and Mahfuz.

The police on Thursday produced Sabir and Mahfuz in the same court and remanded them in judicial custody for 10 days.

Initially, it had been thought Asif had bought the firearms to kill the family members. “But in due course, it was evident he did not need so many firearms and bullets. It seems he had some other intention. We are trying to find out whether he wanted to earn money by selling the arms or operate a gang,” said a police officer.