The hospital treating poisoned spy Sergei Skripal has said a Russian TV crew that sneaked into the facility is guilty of "appalling behaviour".

Footage posted online by British newspapers showed a reporter from the REN TV network walking along corridors at Salisbury District Hospital and commenting on the apparent lack of security.

Wiltshire Police said officers "attended and spoke to two men in the reception area, who were believed to be news reporters. They were asked to leave the hospital and did so. No arrests were made".

The hospital said the footage "shows appalling behaviour".

In a statement, it said: "This footage shows appalling behaviour on the part of these Russian journalists - approaching staff in the middle of the night with no warning and without asking for any permission.

"Our staff, who have been rightly lauded for their recent efforts, working tirelessly to give all of our patients high quality care, deserved better.

"We would like to reiterate that any attempt to harass, intimidate or cause distress to any of our staff or patients is absolutely unacceptable and will not be tolerated.

"We understand the worldwide interest in this story and we have been very open and accommodating to members of the press from around the world.

"Yesterday, for example, we allowed journalists on site for over six hours, yet these individuals made late night attempts to trespass and harass NHS staff.

"We are a busy hospital and make no apology for putting the needs of our patients first."

During the broadcast the reporter casts doubts on the security of the hospital given the seriousness of the attack, He said: "Apparently the Central Hospital of Salisbury is not guarded at all.

"At least there is not any person at the entrance, only a single police car at a distance.

"Nothing is cordoned by tapes and local residents continue to get treatment here."

The following is a transcript of what the Russian reporter says during the broadcast:

Apparently the Central Hospital of Salisbury is not guarded at all. At least there is not any person at the entrance, only a single police car at a distance. Nothing is cordoned by tapes and local residents continue to get treatment here.

This is a technical copy of the video, we were later forced to delete the original by the hospital's guardians, but we managed to see how lives the Central Hospital of Salisbury.

Though externally it's a friendly place with lots of vending coffee machines and paintings on the walls, here are a lot of closed doors. Most likely behind this very door is Sergey Skripal.

This is the Microbiology Department, the door is securely closed, there is a warning 'Do not enter. Keep away'. [It actually says Caution. Slippery Floor Surface'.

Most likely this is the only protection from that very deadly substance, which is called 'Novichok' in England, which the head of the hospital invented for the visitors.

That is all. No visitors in such early hours, but the staff without any fear walk in normal clothes, but warning - here is it not welcomed to talk about the most famous UK patient.

[Speaking to nurses]: 'Excuse me, can you say with whom I can speak about Skripal, how he is doing?'

Nurse: 'No, sorry, I do not know anything, we in this (part of the) hospital just care for newborn.'

Two guards whom we met just shrugged their shoulders at the question of who we can ask about the condition of Skripal and then drove away. But in a couple of minutes appeared other guards , they were far less polite.

Guard: 'Take away the camera, take away the camera.'

Then we had to stop the shoot as the guard rushed at us when we just raised the camera.

We were then told to remove the record, leaving us only the technical copy. But the police they called had no questions for the journalists.

This is a strange inconsistency in everything. Formidable guards guarding the ex-spy coming only in 15 minutes, the officials want to demolish the restaurant and pub where Skripal were sitting on the eve of the poisoning, but the nurses walk freely inside the hospital, where they spent more than a month.