A knife-wielding teenager who terrorised taxi drivers has been sentenced to 10 years' detention.
Mohammed Abdurahman, 19, booked taxis under false names before ambushing drivers alongside accomplices and demanding cash and personal belongings.
He was behind three robberies in Bartley Green, Birmingham, police said.
He admitted three charges of robbery, two of kidnapping, two of possessing a bladed article and one of possessing a prohibited weapon.
West Midlands Police said the crimes took place on 27 October, 30 October and 8 December.
On one occasion, Abdurahman punched the driver in the face and then pulled out a 12-inch knife demanding money.
And on another, he let off suspected CS spray in a driver's face, police said.
The victim was then driven to a secluded area where Abdurahman made off with an Apple Watch. Police said his two accomplices made off with a mobile phone and satnav.
Officers tracked Abdurahman following CCTV checks and links on social media and he was arrested at his home in Rush Green, Bartley Green, on 10 December.
The force said he tried to hide the watch which had been stolen during the last robbery but it was spotted by officers who were able to confirm it belonged to the last victim.
Abdurahman was sentenced to 10 years at a young offenders institute at Birmingham Crown Court on 10 April.
Police said investigations continue into others involved in the robberies.