Police have revealed that they believe missing toddler William Tyrell may be alive, despite fears that he was abducted by a paedophile ring operating on the mid-north coast of NSW. Just a day after William's parents made an impassioned plea for the three-year-old to be returned to them, police have described the 'fast-paced' investigation into the new line of inquiry. 'The two worlds collided. We have information that could link William’s disappearance to a group of people suspected of paedophile activity,' said lead investigator Detective Inspector Gary Jubelin. Scroll down for video . The parents of missing William Tyrrell, who police now say may have been kidnapped by a paedophile ring, have revealed the moment they realised their son was missing . The focus of the investigation has shifted dramatically, and is now 'progressing rapidly', according to Homicide Squad commander Detective Superintendent Mick Willing, reported news.com.au. 'We are pursuing many, many lines of inquiry but what I can say is that there is a team of detectives working very hard. This is a very fast-paced moving inquiry,' Detective Superintendent Willing said. The Detective Sup took a firm stance on the consequences for anyone found to be involved with the toddler's disappearance. 'If you know anything you are implicated. If you are involved you will be charged,' he said. Det Sup Willing also spoke of the heartache William's parents had experienced since his abduction, and said that the family needed answers to where their beloved little boy was. This comes as the three-year-old's mother spoke out about the horrifying moment she realised her son had vanished. Little William's mother frantically searched the house, opening cupboards and yelling out, 'You need to talk to mummy and tell me where you are' in the moments after she found she couldn't hear her son. 'When I realised that William was missing – I think back to that moment where I just went, "I can't hear him, why, why can't I hear him",' she said. William had been in the front yard of his grandmother's house in Kendall, on the NSW mid-north coast, when he disappeared in September last year. 'I just walked out and just I see nothing, I hear nothing, I'm speechless. I'm walking around in a circle on the spot thinking where is he? Why can't I see him? And I'm yelling out, "William, where are you"?' his mother told The Sydney Morning Herald. The toddlers parents released a heart-wrenching video earlier on Friday begging for his return. 'Just give him back ... take him to a church, take him to a police station, take him to school. Give him to someone, give him back,' his mother says in a video released by police. William's father choked back tears as he remembered his son, who was infatuated with the Spider-Man superhero. '(He loved) anything that related to Spider-Man and superheroes,' William's father said in the video. 'He's a cheeky, vibrant little boy ... full of energy. I mean he's my little boy.' One of the new photos released by police of William Tyrrell show the three-year-old smiling and playing guitar, while other images and photos show an energetic and happy youngster full of life . Heartfelt plea: William Tyrrell's distraught parents released a video pleading for their missing son's return as well as home movies showing the lively boy riding his bike (pictured) and playing at the family home . But he said William was a cautious boy who wouldn't go with a stranger. His mother said she had a vision that somebody 'reached over ... has gone `clump' on his shoulders, picked him up and moved him on ... because ... that's the only way ... to explain for him not to be there.' She said the family was struggling with not knowing where William is or what happened to him. 'We need to know what happened to him ... `cause we can't live forever ... like this.' She said she hoped whoever had him was looking after him. 'I want him to be safe, I want him to be feeling loved and I want someone to be looking after him because to imagine that something else is going on ... we can't live like that.' The distraught couple has also released new pictures and home videos of the boy in the hope that new clues will emerge as to his whereabouts. In the videos, William can be seen riding his bike down a path and flashing a cheeky grin, as well as playing a guitar and swivelling his hips in times to the music. 'Just give him back':  The parents (pictured) issued the plea in an emotional video released by NSW Police to encourage people to come with forward with new leads as to the missing toddler's whereabouts . Full of life: The new videos of William Tyrrell (pictured, above at a slightly younger age) show a smiling boy full of energy and his mother has begged kidnappers to show her son care and love if the little boy is still alive, seven months after police believe he was abducted from his grandmother's NSW mid north coast home . The parents of missing three-year-old William Tyrrell have released new pictures of their son and a video pleading for his return by abductors who are believed to have snatched him in daylight last September . Legal restrictions have prevented William's parents from speaking publicly throughout the ordeal, and their identities are not revealed in the video. The footage comes as detectives reveal that they believe the three-year-old may have been abducted by a paedophile ring. Detective Superintendent Mick Willing, NSW Homicide Squad Commander, said on Friday: 'One of our lines of inquiry relates to people we expect to be involved in a paedophile ring.' He said detectives from the homicide squad and the sex crime squad are 'vigorously perusing that line of inquiry and this investigation is moving at a very fast pace.' 'We are persuing every lead that we get,' Detective Willing said. William was last seen dressed in a Spider-Man suit and playing in his grandmother's yard in broad daylight in a quiet street in Kendall last September. Vigorous pursuit: NSW Homicide squad boss Detective Superintendent Mick Willing (pictured) revealed on Friday that police are investigating William Tyrrell's disappearance at a very fast pace and that 'one of our lines of inquiry relates to people we expect to be involved in a paedophile ring' A new home video of cheeky William Tyrrell (pictured, eating cake) has been provided by the family in their desperate wait for the return of the three-year-old, seven months after his probable kidnap . Investigators believe he was snatched during a very short window of time when he was out of sight of his family as he played outside. The parents are calling for any who has any information to contact Crime Stoppers immediately on 1800 333 000. The release of the video comes more than a month since police scoured bushland in Bonny Hills, south of Port Macquarie, for evidence relating to William's whereabouts. Police divers were brought in from Sydney to search a murky dam in a bush reserve and a nearby swamp, after more than 30 officers and the dog squad had spent spent two days searching through dense bushland - including along a track that can only be accessed by four-wheel drive. The three-day search was carried out near local washing machine repairman William 'Bill' Spedding's home. Mr Spedding was identified as a person of interest in the case after he was due to fix William's grandmother's washing machine around the time the toddler vanished. However, Mr Spedding says he didn't go to the house on September 12 because he couldn't get in contact with William's grandmother. Police searched the 63-year-old's home and business in nearby Laurieton in January, seizing various items, including cars, a mattress and computer, for forensic examination. Mr Spedding has strongly denied any involvement and police have previously stressed he isn't their only line of inquiry. Homicide Squad Commander, Detective Superintendent Mick Willing talks to the media in relation to the investigation of missing toddler, William Tyrrell . William was playing in his grandmother's yard dressed in a Spider-Man suit in Kendall, on the NSW Mid North Coast last September when he disappeared in broad daylight . William Tyrrell's parents released this new photo (above) of their missing son, with an impassioned plea in which his mother said she had a vision that somebody 'reached over ... and has gone "clump" on his shoulders' Police divers were brought in from Sydney to search the murky dam in a bush reserve, and a nearby swamp . Sorry we are not currently accepting comments on this article.
Police have said they believe William Tyrrell may be alive after six months.
They revealed this information has changed the focus of the investigation.
Police have issued a strong warning for anyone found connected.
The parents of the toddler released a heartfelt plea for his safe return.
His mother spoke of the moment she realised he was missing.
She said she searched the house in circles telling him to yell out.
His mother said she knew he was missing when she couldn't hear him.
The toddler vanished from his home in Kendall, NSW in September 2014.