Four teenagers have been arrested after a woman was robbed of her laptop computer in Brighton.
One of those who took part in the robbery approached the local woman from behind and pressed what felt like a knife against her neck.
A Sussex Police spokesman said: “This was obviously a very frightening ordeal for the woman.
“I would appeal for anyone who witnessed the robbery or has any information to contact us.
“Four teenagers have been arrested and are helping us with our inquiries and fortunately we have recovered her computer.”
Two of the teenagers are aged 16 and two are 17.
The robbery took place in Elm Grove, Brighton, at about 1.45pm on Wednesday (20 April).
Anyone with information is asked to Sussex Police on 0845 6070999.