Detectives are appealing for information after a man was found with serious head injuries in Hillingdon.
Police officers were called shortly after 10pm on Tuesday (23 July) to an injured man in Gordon Road, Yiewsley.
Officers attended and found a 41-year-old-man from Yiewsley suffering from head injuries.
The man was taken to a central London hospital where he remains in a critical condition.
His next of kin have been informed.
It was reported that the victim had been involved in an altercation prior to being injured.
An investigation has been launched by detectives from Specialist Crime South. Any witnesses or anyone with any information is asked to call police on 101 or contact via Twitter @MetCC. Quote CAD 9037/23JUL.
To give information anonymously contact Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org.