Johannesburg – A Witbank police officer opened fire on policemen and two sheriffs before turning the gun on himself, Mpumalanga police said on Thursday.One of the sheriffs died in hospital as did the officer who shot himself, but another policeman is still in hospital fighting for his life.The incident happened on Wednesday morning, said Brigadier Selvy Mohlala.The two sheriffs had asked police officers from the Vosman police station to escort them to deliver a summons to the policeman's house. The officer, who was due to receive the summons, had been stationed at the Witbank Police Station, which is just a few kilometres away from the Vosman Police Station.Started shooting"The two constables accompanied the sheriffs to a house in Extension 7 but when they got there, they found that the burglar door was locked and there was no response as they knocked on the door," said Mohlala.The sheriffs then cut through the burglar bars."The occupant of the house [who is a police officer] then came out and started shooting at them," Mohlala said."They ran for cover but he kept going for them. He shot the one constable in the head. The other sheriff was shot in the stomach and chest while the other one was shot on the upper hand," Mohlala said. The armed officer then went back inside his house. The uninjured policeman, who had accompanied the sheriffs to the house, then called for backup.Shot himselfBy the time backup arrived, the officer had shot himself inside his house. "He was found in a pool of blood. He had shot himself in the lower jaw," Mohlala said.The house occupant, the sheriffs and injured policeman were taken to hospital. "[The house occupant] passed away yesterday afternoon," said Mohlala.The sheriff who was shot in the stomach also died in hospital."The other police officer who was shot in the head is still in hospital," said Mohlala.Police were investigating the incident.Mohlala said he did not immediately know what was in the summons but he believed it had to do with the repossession of the policeman's house.