A teenage boy was reportedly approached by a male armed with a knife and dressed in a balaclava in a Borehamwood park last night.

Police say officers, including its armed units, responded at 7.50pm (September 26) after the boy ran from Belford Park to seek help.

He managed to get away uninjured and nothing was stolen from him.

A search of the Leeming Road area for the suspected knifeman was carried out by armed officers, with support from a police helicopter, but he remains on the run.

He is described as being white, around 6ft tall, of stocky build, and was wearing all black clothing, including a balaclava.

Police enquiries are ongoing and anyone with information is urged to get in touch with officers.

Detective Sergeant Katie Stevens said: "I understand this incident will have caused concern among the community and I'd like to reassure people that we are doing all we can to investigate.

"We are also working to establish whether those involved are known to each other.

"If you have any information which may assist us in tracing the suspect then please contact us. Any information, no matter how seemingly insignificant, could be key to progressing our enquiries.

"If you'd like to remain anonymous, you can report information through the independent charity Crimestoppers."

Anyone with information can report email DC Stevens at katie.stevens@herts.police.uk, report at herts.police.uk/report or call 101 quoting crime reference 41/77898/22.

Contact crimestoppers on 0800 555 111 or visit crimestoppers-uk.org