Singapore  - Singapore police is investigating a report by a Myanmar national that he was beaten up in a local prison, the Straits Times reported Thursday.

Hong Guo, who served one year in Changi Prison and received cane strokes for slashing a taxi driver, was hospitalized with a head injury that required surgery to remove part of his skull last November.

The 24-year old hospitality student was declared fit for travel by the hospital surgeon before being repatriated last week, but Guo lodged a report of prison beating before he was sent home.

Hanoi - Vietnamese police have arrested four fishermen for killing an oyster diver while illegally fishing with explosives, a police official said Wednesday.

Nguyen Ngoc Liem, head of the Phu Cu District police department in the central province of Binh Dinh, said the fishermen were on their boat Monday morning when they spotted bubbles and movement in the water.

Sydney - Australian police promised more arrests Wednesday as a squad dedicated to breaking up motorcycle gangs rolled through major cities picking up suspects in a show of force.

The crackdown follows Sunday's outrage when a Hells Angels member was bludgeoned to death in front of horrified passengers at Sydney airport.

Fears of outright war between rival gangs were stoked by a double murder in Canberra on Tuesday. But police warned against immediately linking the killings to gang rivalry.

Sydney - An Australian beekeeper found shot dead at his isolated property where he lived alone was killed for his honey, a Brisbane court was told Wednesday.

Donald Alcock, 34, was found guilty of murdering 41-year-old Tony Knight by shooting him in the back while he slept.

"If Tony was home I was going to have to maim him or hurt him bad if I was going to knock off the honey," Alcock told police. "I was only out to hurt him, I wasn't out to kill him."

Manila - Former Philippine president Joseph Estrada is facing an investigation for allegedly displaying in public a toy machine gun, police said Wednesday.

Police Director General Jesus Versoza said Estrada might be charged for violation of a 1982 edict of former dictator Ferdinand Marcos, which prohibits civilians from displaying real or fake high-powered firearms.

"I think there are some executive orders that are prohibiting the use of toy guns and displaying them in public," Versoza said.

Johannesburg - A fourth police official was arrested for charges related to drug trafficking, local media reported Tuesday.

Earlier, police said the head of an organized crime unit and two of his subordinates were arrested on charges of theft, fraud and racketeering.

"They would take some of the consignment [of seized drugs] from the scene of the crime and sell it to drug lords," SAPA news agency quoted a spokeswoman for crime intelligence, Senior Superintendent Tummi Golding, as saying.