A 20-year-old man has sustained serious head injuries in a knife attack at a rave on the outskirts of Letchworth overnight.

The incident – in which police have described the man as being “attacked with a knife” – happened in a field off Baldock Lane between 1am and 2am, and officers have launched an appeal for information and witnesses to come forward.

Anyone with any information about what happened should call 101 or go to at www.herts.police.uk/report quoting ISR 93 of October 7.

Alternatively, you can call Crimestoppers anonymously on 0800 555 111 or through their anonymous online form at www.crimestoppers-uk.org.

No personal details are taken, information cannot be traced or recorded and you will never need to go to court.