A group of experts have renewed calls for a formal inquest into the death of government scientist Dr David Kelly.

They say the official cause of death - a haemorrhage - was "extremely unlikely" in the light of new evidence.

The claim comes in a letter from eight senior figures, including a coroner, published in the Times newspaper.

Dr Kelly's body was found in 2003 near his Oxfordshire home after he was exposed as the source of a BBC story on the grounds for going to war in Iraq.

Instead of a coroner's inquest, then Prime Minister Tony Blair asked Lord Hutton to conduct an investigation, which found Dr Kelly committed suicide.

Lord Hutton's inquiry found the 59-year-old died from blood loss after slashing his wrist with a blunt gardening knife.