A 24-year-old woman is in hospital in a 'serious but stable' condition after she was stabbed in the abdomen.
Detectives in Hillingdon are investigating the attack which happened at Swallowfield Way Industrial Estate in Hayes, just before 6pm yesterday.
The young woman had suffered a single stab wound to her abdomen.
She was given immediate first aid and taken by London's Air Ambulance to a London hospital where she required immediate surgery.
Officers from Hillingdon CID are treating this as attempted robbery and grievous bodily harm.
No arrests have been made.