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.

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