Who are the main suspects in the David Spencer and Patrick Warren case?
THE disappearance of David Spencer and Patrick Warren has baffled criminologists for over a decade. Brian Field  6 Brian Field is the only suspect in the case Credit: PA:Press Association  Convicted rapist and murderer Brian Field was interviewed by cops in connection with the boys' disappearance when the case was reviewed in 2006. Land he was used as a dumping ground at Old Damson Lane in Solihull was dug up by officers. He was questioned by detectives but nothing could tie him to the crime. One of the lead officers on the review, Det Ch Insp Mick Treble, said: "He had a van, he was in the area at the time, but there was nothing tangible to tie him to the boys,  6 Convicted rapist and murderer Brian Field was interviewed by cops in connection with the boys' disappearance Credit: Enterprise News and Pictures  "He had nothing to lose. We said, 'give the parents some closure and tell us what happened'. "But it was a vehement denial. He said there was nothing he could help with." Field became a suspect in 2006 due to his numerous crimes against children. In the past Field had been fined for gross indecency in 1969 as well as serving a two-year sentence for the attempted abduction and indecent assault of a 14-year-old boy in Aberdeen. 6 Field, pictured, became a suspect in 2006 due to his numerous crimes against children Credit: PA:Press Association  He had also served two sentences in the 1980s of four years each for two counts of unlawful sex with underage boys and falsely imprisoning two teenage boys. Field denied any involvement in the boys disappearance and police said he was just one line of enquiry in their investigation. Field was jailed for life in 2001 for the rape and murder of 14-year-old Surrey schoolboy Roy Tutill, killed in 1968. Field was living in Solihull when he was stopped for drink-driving in 1999. He had a DNA sample taken which matched the DNA sample taken in Tutills case. 6 Field was jailed for the rape and murder of 14-year-old Surrey schoolboy Roy Tutill, pictured Credit: Enterprise News and Pictures  During his trial Field, then 65, pleaded guilty to murder but not sexual assault. He was sentenced to life behind bars on February 21, 2001. Fields present whereabouts are not known. David Spencer and Patrick Warren disappeared on Boxing Day, 1996. The disturbing case has now become known as the Milk Carton Kids after after police printed pleas for information on milk containers. The two schoolboy were playing in Chelmsley Wood, Birmingham, when they vanished. They said they intended to go and visit one of Patricks brothers. 6 David Spencer and Patrick Warren disappeared on Boxing Day, 1996 Credit: Collect  Patrick was riding his brand-new Apollo bicycle, which had been a Christmas present, while David was on foot. The pair were last spotted at a petrol station at 00.45am on December 27, 1996, who gave them a packet of biscuits. They were reported missing the next day. Patricks red Apollo bicycle was later discovered in the bin area at the back of the petrol station. 6 The pair were last spotted at a petrol station at 00.45am on December 27, 1996 Credit: SWNS:South West News Service  Despite two major police investigations being launched into the boys' disappearance, their bodies have never been found. Davids brother, Lee OToole, who was nine when his brother disappeared, made a public appeal in 2016 for more information. He said: Ive come to terms with the fact David is dead but I wake every night wondering what happened to him and how he died,  I just want to find him so he can be laid to rest and we can have somewhere to go and visit him.  DCI Caroline Marsh, from the homicide team at West Midlands police has said that they will not close the case. Most read in TV BRUTALLY HONEST Katie Price red-faced as son Jett, 7, says she's only 'sort of' a good mum on fleesh! Corrie's Richard Fleeshman looks unrecognisable 15 years after leaving LITTLE CHAMP EastEnders' Ricky Champ shares rare pic of daughter on family day out PADDY Kerry Katona in furious row with Tessa Hartmann over padded bikini tops for children SKINNY JEANS Tyrone's midlife crisis continues as Alina gives him a makeover in Corrie KAT'S TATT EastEnders' Jessie Wallace shows off huge back tattoo as she gets petrol  She said: I do believe that the boys are deceased and something very serious must have happened to them,  If the boys were murdered someone knows who is responsible for that and I appeal to anyone with information to come forward.  She added: Our thoughts are with the families as the 20th anniversary approaches, and we continue to support them through our family liaison officers. Until we find out what happened to David and Patrick, this investigation will never close.