A pervert chased after a teenager down an alleyway with his trousers pulled down.

A man in his 30s or 40s exposed himself to a 14-year-old girl as she walked on a service road between the Sovereign Harbour Asda store and Hereward Road in Eastbourne on Saturday at 11.30am.

As the girl tried to escape his attentions, the man followed her with his jeans down for about 20 seconds before he turned around and went in the opposite direction.

The pervert is described as tall, average build and was wearing a blue top and three-quarter length jeans at the time of the incident.

Anyone with information should email 101@sussex.pnn.police.uk quoting serial 668 of 27/09 or call 101.