A man was stabbed and left for dead by two raiders who demanded the keys to his Mercedes car outside his home, police have said.
The 59-year-old victim was targeted as he walked out of his front door in Hindley, Wigan, on Sunday morning.
Two men immediately stabbed him multiple times as they told him to hand over the keys to his white Mercedes C220 vehicle shortly after 9.55am.
His attackers ran off empty-handed from the address in Worcester Avenue. The victim was taken to hospital where his condition is described as "very serious".
The offenders are described as white, with one wearing a pale pink or red top with his face covered and the other wearing a pale blue top with stripes down the sleeves.
Detective Inspector Graham Atherton, from Wigan CID, said: "This was a horrendous attack on a defenceless man which has left him fighting for his life in hospital.
"These two men approached him on the doorstep and before they demanded his car keys they stabbed him multiple times and left him for dead.
"I am sure local residents will be shocked and angered by what has happened, but I want to try to reassure them that we have a team of experienced detectives working on the investigation and are determined to find the men responsible.
"I would urge anyone who may have witnessed the attack or saw men matching these descriptions in the area to contact me as soon as possible, you information could be vital to our investigation."
Anyone with information should phone police on 0161 856 5307 or the independent charity Crimestoppers, anonymously, on 0800 555 111.