The autopsy on the body of actor Philip Seymour Hoffman has proved inconclusive in regard to the cause of his death.

An official from the medical examiner's office in New York City said yesterday that further tests would be required to establish what killed the 46-year-old movie star.

Spokeswoman Julie Bolcer explained that there is no timetable for completion of Hoffman's post-mortem examination - and refused to comment on which further tests are needed.

However the BBC reports that toxicology and tissue tests are usually carried out in such cases.

His family has issued a statement following his tragic death at the weekend.

It reads: "We are devastated by the loss of our beloved Phil and appreciate the outpouring of love and support we have received from everyone.

"This is a tragic and sudden loss and we ask that you respect our privacy during this time of grieving. Please keep Phil in your thoughts and prayers."

Meanwhile Hugh Jackman has paid tribute to his New- York neighbour.

Speaking to Extra, he said: "I'm just devastated… I'd see him, he lives close by to me," Jackman explained. "I'd see him with his kids.

"[He was] one of the great actors of our generation, a great family man. It's terribly, terribly sad, a great loss."