Two teenage boys robbed a man at knifepoint while riding stolen motorbikes.The youths, aged 15 and 16, admitted holding up the stranger at night near the city centre.They sped away on stolen motorcycles with the man's mobile phone, computer games console, jacket and rucksack, Plymouth Crown Court heard.The youths, who cannot be named, pleaded guilty to robbery on February 23.The 15-year-old also pleaded guilty to possession of a locking Stanley knife in Cornwall Street that same night.He was in...
