A group of men stole a sat-nav and punctured the tyre of their victim's car with a knife.

At around 9.30pm on June 20, four black men got out of a 67 plate black Mercedes and approached a man in his 20s as he was parking on Hornbeam Close, Buckhurst Hill.

The men threatened the victim with a knife, stole a Sat Nav from his car and punctured one of its tyres.

The man was not injured during the incident.

Witnesses or anyone with information is asked to contact DC Ben Elliott at Loughton CID on 101, quoting reference 42/86891/18.

You can also contact the independent charity Crimestoppers completely anonymously on 0800 555 111 or online at crimestoppers-uk.org.