A brother and a sister have been hacked to death in Mullegama, Nawagattegama.
Police said they were murdered following a family dispute.
Police said the elder brother of the woman had arrived to resolve a dispute between the husband and wife.
During the commotion, the husband had attacked the brother of the wife with a sharp object. Subsequently, the man had also killed his wife.
The deceased are aged 25 and 32 years. The suspect who sustained injuries in the commotion is receiving treatment at the Puttalam Hospital under police protection.