Four bodies were found in a house in Kaudana Road Dehiwala this morning.
It was identified that the bodies belonged to members of the same family.
On a tip off received by Dehiwala Police, the four burnt bodies were found lying on the ground floor of a three storied building.
The victims were 65 year old father, 52 year old mother, 13 year old daughter and a 13 year old niece.
Police have initiated investigations to the incident.