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A sick troll ­on Facebook threatened to stab the father of a missing man and claims to have murdered his son before “burying him in water”.

Police are hunting the sicko who sent the chilling messages to Allan Bryant senior through a social media page set up to help find his son, who has been missing since 2013, the Daily Record reports.

The 50-year-old dad, who has campaigned tirelessly for information after Allan junior disappeared from a nightclub in Glenrothes, contacted officers after receiving the threat.

The troll wrote: “I’ve killed your son, you’ll never find him. I’ve stabbed him and buried him in water.

“You’re next, fat boy – you’re getting stabbed. How do you feel knowing we’ve killed your son?”

Allan told how he was forced to block his front door with chairs ­overnight while police carried out regular patrols outside his home.

But he has vowed that he will not be stopped from trying to find his son, who he believes has been murdered.

Allan said: “I woke up on Saturday morning and started checking my messages.

“I had one from this guy saying, ‘I’ve killed your son, you’ll never find him. I’ve stabbed him and buried him in water.’

“This was 5.55am and the messages continued until 2.14pm.

“It was totally out of the blue and I really don’t know very much about this individual.

“But then he said to me that I was next and he was going to stab me. I screenshotted all the messages and sent them to the police who have ­red-flagged the house.

“We were also told that there would be officers walking past the house all night so obviously the police know who this individual is and it must by quite serious judging by the way they’ve reacted.

“It does hurt. You’re just sitting there wondering if these people are for real. I put chairs up in front of my doors last night just in case.”

Allan has been battling to find ­information about his son’s disappearance since he went missing in the early hours of November 3, 2013, after leaving Styx nightclub in Glenrothes.

(Image: Police Scotland)

Allan jnr, then 23, was seen ­staggering out of the building on CCTV but failed to complete the 10-minute walk to the family home and hasn’t been heard from since.

He had left his jacket at the party and had no money or bank cards on him. He did not have a mobile phone with him because his was broken.

His dad and the family believe he was murdered and his body hidden, and are trying to get to the bottom of his disappearance.

In August 2014, another vicious troll – who targeted the family claimed to have electrocuted, tortured and killed Allan jnr – was jailed for his horrific claims.

Stewart McInroy was handed a 10-month sentence after pleading guilty to sending the messages to the Bryant family.

But Allan snr added: “Our main focus is finding Allan. When things like this happen, you ask yourself why they’re even doing it. All I’m doing is looking for my son.”

The terrible ordeal has taken its toll but Allan says he will never give up trying to find out what happened.

He said: “You sit there worried sick. The last troll that sent messages like this received a prison sentence.

“So I would say to this individual – you will get caught and the police will find you. You will be facing a very heavy prison sentence.

“It does hurt but at the end of the day, nothing’s going to stop me looking for my son. It’s as simple as that.”

Police Scotland said: “We are aware of a threatening online communication that was sent to Mr Bryant.

“We have spoken to Mr Bryant, and are investigating this to establish the full circumstances.”