Three men, a woman and a 9-year old boy were found dead, in what is suspected to be a multiple suicide or murder-suicide, at a house in the Suksawat area of Bangkok on Thursday morning.
Neighbours reportedly said they heard several gunshots inside the house in a housing estate and immediately alerted the police.
Police from Thun Khru police station rushed to the scene, where they found the victims lying dead on the floor in pools of blood. One of the men was found to be holding a pistol in his hand.
Police said that the man with the gun was the owner of a company, but had no idea of the actual motive behind the deaths of the five members of the same family.
Pol Col Suravet Karnwattanasirikul, Superintendent of Thung Khru police station, told the media that the five victims were members of a family which engaged in the auto parts trade.
An investigation is underway.