India, Sept. 7 -- Three relatives of the couple lynched in Bengal's Nadia district on Saturday over suspicion of murdering their neighbour's eight-year-old son were arrested on Sunday, police officials aware of the investigation said.

A villager, identified as Soumyajit Biswas, was also arrested on Sunday for the lynching in which police registered a seperate suo motu case.

Police officials said the kidnapping and murder of the child is being probed on the basis of a complaint by his father, Satyen Biswas, who told the local media that he had no enmity with his neighbours. The post mortem report said the boy was strangulated.

Utpal Mondal, 45, an e-rickshaw driver, and his wife Soma Mondal, 38, were lynched by some residents of Nisichi...