Melbourne, Dec 14 (PTI): The staff of an Australian radio station, whose DJs made a prank call to a UK hospital that led to the death of an Indian-origin nurse, have received death threats, prompting some of them to move to safehouses.

About a dozen staff of Sydney-based 2DayFM radio station have been moved into safehouses and up to 10 executives have been assigned bodyguards following death threats against them, the Daily Telegraph reported.

The station management has recruited 24-hour security to guard the staff and the safehouse venue, costing the company an estimated USD 75,000 a week, the report said.

The development came after a threat letter was received yesterday against Michael Christian, one of the DJs whose prank call led to the death of 46-year-old Jacintha Saldanha.

The letter, which came from South Australia, stated "bullets out there with your (Christian's) name on it". Further unreportable threats involving a shotgun were also made. The letter was seized by detectives for examination.

Australian police have initiated a probe into the death threats and have spoken with the Southern Cross Austereo's employees about security and other matters and are also monitoring social media for other threats, the paper said.

The company which runs 2Day FM radio station has been under severe criticism after Mel Greig and Christian posing as Queen Elizabeth II and Prince Charles made the call which was received by Saldanha at London's King Edward VII Hospital.

She put them through to a colleague who divulged details of the pregnant Princes Kate's health conditions. Saldanha was subsequently found dead.

Meanwhile, the company said it was preparing at the long-haul, with specialist security expected to be in place for several weeks or months.

"We still have details to come from the hospital and the release of the suicide note. Depending on what comes from that could trigger more anger," the paper reported quoting a source.