A gang of thieving teenagers have been jailed after a string of moped-enabled robberies - and threatening victims with knives. The four youngsters, one only 15, rode scooters to rob phones, wallets, handbags and laptops before speeding off, leaving their victims lying on the floor. Six scooters were also stolen by the group with four of those taken from their owners by force. The young thugs also posed up for pictures wearing masks and waving weapons.