Police have reportedly arrested two suspects for the murder of a police officer's missing brother, whose dead body was found behind a deserted factory in Ubon Ratchathani on Monday.

Four other suspects, including his wife and her son, remained at large.

Police on Tuesday arrested Julladet Klaifon, 20, and an unnamed 18-year-old, Daily News Online reported.

The victim was identified as Suthen Tharabut, 36. He had earlier been reported missing by his elder brother, a policeman based in Ubon Ratchathani.

During questioning, the suspects allegedly told police the victim had been jealous and argued with his wife of two years. The woman then phoned her 20-year-old son, identified only as Ufa, for help.

When Mr Ufa arrived, he had an argument with his stepfather before leaving the house with his mother, according to police.

Mr Ufa later called his two friends for help and told his mother to arrange a meeting with Suthen to settle their dispute, near a temple.

When the man arrived, Mr Julladet allegedly attacked him with a wooden baton. The victim tried to run but fell to the ground. The two arrested suspects allegedly told police that Mr Ufa then stabbed his stepfather to death with a knife.

A pickup truck was used to dump the body in a forested area behind an abandoned shoe factory.

Daily News Online reported that four other suspects, the wife, her son and two alleged accomplices remained at large.

The body was found in trees behind the factory on Monday after local residents reported seeing a dog in the area carrying a human skull.