Four teenagers were arrested this week following a spate of robberies on taxi drivers in the Midlands area.
West Midlands Police are looking into five robberies and three attempted robberies on cabbies in a 48 hour time period in the Dudley and Sandwell area.
Police confirm that drivers were attacked and had cash taken.
A male, aged 15, was arrested Friday on suspicion of attempted robbery.
Thee further three teens, a 17-male aged 17, and two females aged 16 and 17, were all arrested on suspicion of robbery.