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Creepy footage captures the phantom at a window of the spooky building, which is said to be haunted with scary spirits.

Lee Smart was out investigating Mountain Ash Hospital near Caerphilly, south Wales, and believes the spectre at the window shouted “You watch your back, ha ha ha, cause I’ll… I’ll kill you”.

The professional ghost hunter said: “There was something in the window of the hospital. We all watched it, and you can see the thing in the window.

“Anthony [Lee’s colleague] said let's go in that room and do EVPs (electronic voice phenomenon). Straight away we started having 'get out'.

"My name was called, it wanted to kill me, it wanted me out of the hospital for some reason.

“There was no faking, there was no rubbish.”

(Image: MERCURY)

(Image: MERCURY)

The dilapidated hospital, which has remained derelict since its closure in 2007, is believed to be riddled with ghosts, including that of staff who worked there decades ago.

The 45-year-old added: “After we shared our footage online of what we witnessed that day, it went chaotic online.

“Apparently, lots of people had seen a little girl wandering around in the past.

“A security guard got in touch with me said he heard noises, screaming and stuff like that."

(Image: MERCURY)

Anthony, 30, said: "It was like someone was watching and then stepped back [from the window].

"I have been doing this [paranormal investigating] for 10 years now and it's one of the most active places I have been.

“That place is really good for this kind of thing as a lot of death occurred there."