( CNN ) -- Michigan authorities are pursuing a new lead in the case of the infamous Oakland County child killer who abducted and murdered at least four boys and girls in the 1970s . `` We would be thrilled if this is the one piece of evidence that we are looking for to give closure to the families , but we want to do our due diligence '' said Michigan State Police Lt. Michael Shaw . Parts of a blue AMC Gremlin with a white stripe were unearthed at a construction site in Grand Blanc Township on Monday . The car matches the description of a vehicle seen near the scene of one of the kidnappings . New DNA work may offer break in slayings . `` We received an anonymous tip of car parts recovered in the excavation of a new homes subdivision , '' Shaw told CNN . `` There was that blue colored Gremlin with the white stripe down the side of it . We sent out our crime lab from Bridgeport to investigate and see what the situation was . `` Right now we are continuing to excavate the site to see if there is any more evidence we can locate , '' Shaw said . The Oakland County Child Killer Task Force was also notified , Shaw added . The search for the serial killer has lasted for more than 36 years . Police agencies have pursued some 20,000 tips in the hunt for the perpetrator of the unsolved murders , which took place over a 13-month period between 1976 and 1977 . Mark Stebbins was 12 when he was abducted in Ferndale on February 15 , 1976 . His body was found nearly a year later . Jill Robinson was also 12 when she was kidnapped on December 22 , 1976 . Her body was found four days later . Kristin Mihelich was 10 when she disappeared in Berkley on January 2 , 1977 , and her body was found later that month . Timothy King was 11 when he vanished in Birmingham on March 16 , 1977 . His body was found one week later . Several other children who went missing or were killed during that time may period also may have been victims of the Oakland County child killer , according to the task force . Shaw cautioned that this new lead may turn up empty . `` We 're not sure if this has anything to do with it , '' he said . `` In Michigan , this used to be farm land so it was common for farmers to bury their scrap metal . Since this is a vehicle that we have been looking for for years , we will make sure if it 's part of the crime scene or is n't , and rule it out . `` The evidence has been in the ground for some time so we may never put it back together . '' Baby-killing nurse set to walk free .
Four children , maybe more , were victims of a serial killer in the '70s . Michigan police are looking at car parts buried on farmland . The parts were discovered during construction for new homes .