Police are appealing for witnesses and information following a burglary which ended with two people being assaulted.
Officers were called just after 21:50hrs on Thursday, 19 January to a report of a burglary at a residential address on Victoria Road in Ruislip.
Four suspects forced entry via the porch door of the property whilst four people were inside.
The men went from room to room, demanding gold and breaking items. They eventually left empty-handed.
The suspects left the house and got into a car. Upon seeing a man outside on the phone, one of the suspects picked up a piece of concrete and threw it at the victim’s head.
The victim, a man in his late 40s, fell to the floor. The car then mounted the pavement and was driven towards the victim. He was not hit by the car but required hospital treatment following the assault.
Another member of the public was then approached and sprayed in the face with an unknown liquid. He also required hospital treatment, but has since been discharged.
The suspects drove off in the direction of South Ruislip. They were all wearing dark clothing, woolly hats and had black scarves covering their faces. They were in a dark-coloured car.
Detective Constable James Williamson, of Hillingdon Borough, said: "This was a terrifying burglary which ultimately left two people injured. This happened on a main thoroughfare in Ruislip Manor, and at this time of night there would have been countless people in the area. I would urge anyone who saw anything that may help us trace these men to get in touch."
There have been no arrests, and enquiries continue.
If you have any information that can assist the investigation, please call 101 or make contact with the burglary squad at Uxbridge police station on 020 8246 2112.