Two arrests have been made following an incident in which police officers were threatened by a knife-wielding man.
Police were in an unmarked car on the A4, at 11pm on Monday (July 27), when they spotted three men on mopeds driving at speed and swerving across lanes of traffic.
As the police van activated its blue lights, all three sped off.
One suspect fell off his moped at Hogarth roundabout, Chiswick, and after a struggle, was detained.
The other two suspects then returned, circled the officers shouting threats, and one waved a knife and threatened to stab them if they didn't release the third man.
A bus driver stopped his vehicle and jumped out to help.
Two of the men were subsequently arrested and when police searched the mopeds they found 10 bags of herbal cannabis, a screwdriver and bolt cutters.
The first suspect, believed to be aged in his 20s, was arrested for: dangerous driving, possession with intent to supply class B drugs, theft of a motor vehicle, going equipped, affray and assault on a police officer. He was also further arrested for breaching his ASBO.
The second suspect was arrested for: dangerous driving, possession with intent to supply class B drugs, theft of a vehicle, and affray.
Both were taken to a police station for questioning and remained in custody on Tuesday afternoon (July 28).