Two people robbed by man with knife in Derby
An 18-year-old man and a 17-year-old girl have been robbed by a man armed with a knife in Derby.
A man stopped the pair as they were walking along Arthur Street at about 0310 BST on Thursday.
He demanded their mobile phones and cash, and threatened the man with a knife.
The robber then ran off towards the city centre with a wallet and two Blackberry mobile phones. Police are appealing for witnesses.
Detectives want to trace a man described as being in his late teens or early 20s, about 5ft 10in, of a skinny build, wearing a balaclava and a dark coloured track-suit.