A man was found with stab injuries after he was involved in a three-crash on a busy road in north-west London.
Emergency services raced to the scene of the crash in Hendon Way at about 8.20pm on Sunday, and the man was rushed to hospital by paramedics.
It is believed that the motorist may have been the victim of an attempted robbery on nearby Graham Road moments before, police said.
His injuries are not believed to be life-threatening.
Road closures were put in place as a police investigation was carried out and motorists were warned to avoid the area.
A police spokesman added: “There have been no arrests and enquiries continue.”