“Immediate action” is being taken after blueprints of jail layouts were shared online.

The maps detailing the layouts of prisons in England and Wales were leaked on the dark web over the past fortnight, according to The Times.

The detailed information is said to include the locations of cameras and sensors, prompting fears they could be used to smuggle drugs or weapons into prisons or help inmates plan escapes.

Security officials are now working to identify the source of the leak and who might benefit from the details.

The Ministry of Justice did not disclose which prisons were involved in the breach.

A government spokesperson said in a statement: “We are not going to comment on the specific detail of security matters of this kind, but we are aware of a breach of data to the prison estate and, like with all potential breaches, have taken immediate action to ensure prisons remain secure.”

The leak comes amid a chronic prison overcrowding crisis, which has led to early release schemes and the re-categorising of the security risks of some offenders to ease capacity pressures.

Justice Secretary Shabana Mahmood is launching a sentencing review in a bid to ease the crisis.

A man has been arrested on suspicion of murder after one man died and another was critically injured in a shooting in Birmingham.

Police were called to Rotton Park Road in Edgbaston, just before 11pm on Friday, to reports that two people had been shot.

One man, in his 20s, was found in a car but was pronounced dead at the scene.

Another man, in his 30s, was found injured at a bus stop, and was taken to hospital where he remains in a critical condition, West Midlands Police added.

Firearms officers arrested a man in his 30s on suspicion of murder just before 12.30am. He remains in custody.

Officers remain on the scene, with road closures in place. The force said reassurance patrols will also be taking place.

Detective Inspector Nick Barnes said: “This is a tragic incident, and we have worked through the night to understand exactly what happened.

“We’ve already made good progress and arrested a suspect, but I still need to hear from anyone who was in the area that we’ve not already spoken to.

“This happened near the busy junction with City Road and it may be that you’ve got dashcam footage or mobile phone footage from the area just before 11pm.

“We really need to hear from you so that we can build as clear a picture as possible of what happened.”

Officers are urging anyone with information to get in contact, with anonymous tips also taken via Crimestoppers.

Two people detained during a security incident at Gatwick Airport have been allowed to continue their journeys after a suspect package saw a “large part” of the South Terminal evacuated.

The terminal was closed for hours after the discovery of a “suspected prohibited item” in a passenger’s luggage sparked an emergency response. It reopened at around 3.45pm.

Officers from the EOD (Explosive Ordnance Disposal) team “made the package safe” before handing the airport back to its operator, Sussex Police said.

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Their statement continued: “Two people who were detained while enquiries were ongoing have subsequently been allowed to continue their journeys.

“There will remain an increased police presence in the area to assist with passengers accessing the South Terminal for onward travel.”

The force also thanked the public and airport staff for their patience while the incident was ongoing.

Earlier the airport, which is the UK’s second busiest, said the terminal was evacuated after a “security incident”.

“The earlier security alert has now been resolved and cleared by police,” it later said in a statement on Friday afternoon.

“The South Terminal is reopening to staff and will be open to passengers shortly.”

Gatwick said some flights were cancelled while others were delayed.

It said passengers should contact their airlines for any updates on flights.

Footage on social media taken outside the airport showed crowds of travellers heading away from the terminal building.

“Arrived at London Gatwick for routine connection. Got through customs to find out they’re evacuating the entire airport,” one passenger said.

“Even people through security are being taken outside. Trains shut down,” another passenger added, who said “thousands” of people were forced to leave.

Another passenger said people near the gates were being told to stay there and not go back to the departure lounge.

People outside the airport were handed blankets and water, passengers told Sky News.

The airport said its North Terminal was still operating normally.

Gatwick Express said its trains did not call at Gatwick Airport during the police response, but the airport said trains would start calling there again once the terminal was fully reopened.

More than 600 flights were due to take off or land at Gatwick on Friday, amounting to more than 121,000 passenger seats, according to aviation analytics firm Cirium.