Police are investigating incidents that led to the body of a Malaysian woman’s being found encased in a block of cement in Brunei.

Voon Su Ching, 39, was found five days after she was reported missing by her husband on February 13 when she did not return home from an errand to buy their son’s birthday cake, Brunei police told AFP.

Voon’s body was found at the garden of a friend’s home after the owner discovered a three-meter high block cement in her garden. Her friend had reportedly asked Voon to check on her house while she was on vacation over the Chinese New Year holidays.

An autopsy had been completed and police were awaiting the post mortem examination report to determine the cause of death, Royal Brunei Police Force spoksman Pengiran Abdul Salam Ghani said.

“The body of the victim has been returned to the family and will be repatriated back to Malaysia,” he told AFP.

Violent crime is unusual in the oil-rich sultanate with a population of just under 400,000 people, according to AFP.