A man lies in critical condition in hospital more than five days after a horrific unprovoked attack on two men in Hayes .
A group of men stepped out of a silver car and attacked the victims before they drove off, police said.
The incident happened between 10pm and 10.30pm on Monday (March 6).
One victim, aged 45, is in serious condition at a central London hospital.
The second victim, aged 28, was not seriously injured.
Hillingdon police are appealing to anyone who may have witnessed the incident or has any information in relation to the assault.
Detective Constable Mark Henry of Hillingdon Police who is leading the investigation, said: "At this early stage it appears to be an unprovoked attack which has left a man critically injured in hospital.
"I am appealing to anyone who was in the area at the time of the incident and, in particular, who saw a silver car being driving erratically in the Ayles Road and Morrison Road area, to contact police."
Anyone with information is asked to contact DC Henry on 020 8246 1455 or call 101 or tweet @MetCC.
Alternatively, contact Crimestoppers anonymously via 0800 555 111.
No arrests have been made.
Police enquiries continue.
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