Prison blueprints leak sparks security alert in jails in England and Wales

Plans are understood to show where cameras and sensors are, triggering fears of weapon smuggling and escapes

Detailed prison blueprints have been leaked, triggering a security alert at jails in England and Wales, it has emerged.

The leak, first reported by the Times, involves prison layouts being shared on the dark web in the last fortnight, prompting an investigation by the National Crime Agency.