( CNN ) -- Somebody took Jessica Heeringa from a Michigan gas station Friday night . Police seem certain of that but say they 're `` grasping at straws '' for other evidence that might help them find the 25-year-old cashier . Norton Shores , Michigan , Police Chief Daniel Shaw said that by Tuesday morning authorities had gotten 150 tips in the Heeringa case , but nothing conclusive . `` A lot of interesting tips that we can follow up on . Whether or not they 're solid , it 's hard to say because we have so little to work on with physical evidence . We 're just grasping at straws . ... We 're grasping for straws with whatever we can find at the scene , '' Shaw told CNN affiliate WOOD . Shaw said a DNA sample was found at the gas station , but he could not tie it to Heeringa 's disappearance , WOOD reported . That sample is being tested . Heeringa was scheduled to close the Exxon station where she was working alone at 11:30 p.m. Friday . But at 11:15 , police got a 911 call that the station was unmanned . `` It 's very suspicious why there 's nobody here , '' the 911 caller says in a tape police released Monday . Based on the way the station was left , police say they believe somebody abducted Heeringa . `` Her purse and other belongings were undisturbed . In addition , the store 's cash drawer was found out and no money was missing , '' police said in a statement . Police are looking for the driver of a silver minivan who was seen in the store 's parking area late Friday , they said . A press release describes him as a white male , between 30 and 40 , with wavy hair parted in the middle . The van could have been a Chrysler Town and Country , police said . The Exxon station did not have security cameras , but late Monday police released video they think shows the van driving by a nearby business . The video is blurry , the van is only seen for a few seconds , and neither a driver nor license plate can be seen . `` I wish I had the technology like you see on TV where you could blow it up and I could see the driver inside . But that does n't exist for me , '' Shaw told WOOD . But it is something . `` It does give us some hope that we 've got some accurate information out there to work with , '' he told the station . Heeringa 's family and friends in the community of 22,500 near Lake Michigan were posting missing posters around the area , and a Facebook page was set up for people to offer clues or support . `` We are searching ! Hang tight ! The whole Country wants you home ! '' said a Facebook post from Monday morning . Heeringa is described as 5-foot-1 , 110 pounds with blond hair , blue eyes and wearing wire-rimmed glasses . Heeringa 's mother , Shelly Heeringa , told CNN affiliate WZZM that she thinks her daughter 's abductor was a past customer who knew Jessica and the store . `` She 's very helpful , that 's why I think he lured her out of the gas station , '' the mother told the station . `` He knew there was n't security cameras . '' People with information that may help find Heeringa are asked to call the Norton Shores police at 231-733-2691 .
Police say there 's scant evidence to go on . Blurry video shows van whose driver police are looking for . `` I wish I had the technology like you see on TV , '' chief says . Score: 6