Police set up a tent in the garden behind Steven Clark's elderly parents' house after the two were arrested for the murder of their missing son.
Steven Clark visited the bathroom while on a family walk near Saltburn Pier in Cleveland in December 1992 but was never seen again.
His parents, Doris and Charles, who live in Marske-by-the-Sea, Cleveland, this week, have confirmed they had been arrested on suspicion of murder, and his mother described the situation as "absolutely ridiculous."
Police made the arrests after a cold case review, and specialist officials began their investigation in the back garden of the couple's home on Friday.
This morning, five police cars and delivery vans, an investigation vehicle at the crime scene and a task force unit were parked in front of the duplex.
A barrier has been placed on a public footpath that runs alongside the house on Coast Road in town. And in the back garden there was a police tent.
A police tent has been erected in the back garden of Steven Clark's childhood home while officers continue to investigate his alleged murder
Police believe Steven has been seriously harmed and a homicide investigation has been opened. His parents – Doris, 81, and Charles Clark, 78, were arrested on suspicion of murder
Steven left his home in Marske for a family walk before using the gentlemen's public restrooms near the pier on the boardwalk in Saltburn, Cleveland while his mother went into the ladies.
This came after the police asked an anonymous letter writer who contacted the officers in September 1999 to contact him again.
Police said their records showed officials reviewed the letter and recorded the information. However, the force refuses to reveal the contents of the letter or why it is now considered important more than 20 years after it was sent.
As a result, and because there is no evidence of life, detectives believe Steven has suffered serious harm and a homicide investigation has been opened.
Steven mysteriously disappeared in Saltburn on Monday, December 28, 1992. A missing person report said he was last seen at 3 p.m.
The 23-year-old, who lived in nearby Marske, reportedly went to a public toilet while his mother went to the ladies. He was not seen coming out of the gentlemen on the town's seafront and did not return home.
Over the years, his parents asked for information several times in order to find their son. But this week, Stevens' older parents – Doris, 81, and Charles Clark, 78 – confirmed they had been arrested on suspicion of murder.
Ms. Clarke said, “It's just absolutely ridiculous. There's nothing more to say, it's surreal. "When she denied murdering her son, she replied," Absolutely, yes.
"It's just too hard to believe, but we have to believe it and face the consequences." She said being on bail was "awful" and added, "I can't say anything but the shock of being arrested."
“It's difficult, isn't it? "You get so tense and angry, we just have to move on, I'm afraid. There's nothing we can do, just wait and hope we can do it. & # 39;
When Ms. Clark arrived at the front door that evening, she added, "We just got back, we've been there all day."
Cold Case Unit detectives in Cleveland and North Yorkshire reopened Stevens' case after conducting an investigation into the circumstances surrounding his disappearance
A police tent was erected in the back garden of Steven Clark's childhood home while officers continue to investigate his alleged murder
At the time of Mr. Clark's disappearance, posters were on display for missing people
Detective Chief Inspector Shaun Page asked the letter writer to call Crimestoppers anonymously or the investigation team directly and provide them with additional information.
He said, “I cannot divulge the contents or subject of the letter, but it was mailed to the Guisborough Police Station incident room.
The person who sent it may know more about what could help our investigation team. You obviously felt compelled to write the letter seven years after it disappeared, and I would like to hear from you again now.
“The overall response we have received from the public is that a lot of people knew Steven from life in Marske. I would like to thank the local community for their cooperation so far on this investigation.
"We still want people to tell us if they know Steven or if they have any information that will help the investigation."
Anyone with information can use the Cleveland Police section of the Major Events Public Portal at https://mipp.police.uk/, call the Cleveland Police on non-emergency number 101, or Crimestoppers anonymously on 0800 555 111.