Heeringa is described as 5-foot-1, 110 pounds with blond hair, blue eyes and wearing wire-rimmed glasses.
Heeringa was scheduled to close the Exxon station where she was working alone at 11:30 p.m.
Based on the way the station was left, police say they believe somebody abducted Heeringa.
Heeringa's purse was left in the store, and her car was still there, WOOD reported.
People with information that may help find Heeringa are asked to call the Norton Shores police at 231-733-2691.
Heeringa is described as 5 feet, 1 inches tall, 110 pounds with blond hair, blue eyes and wearing wire-rimmed glasses.
Shaw said a DNA sample was found at the gas station, but he could not tie it to Heeringa's disappearance, WOOD reported.
Heeringa's mother, Shelly Heeringa, told WZZM that she thinks her daughter's abductor was a past customer who knew Jessica and the store.
Norton Shores, Michigan, Police Chief Daniel Shaw said that by Tuesday morning authorities had gotten 150 tips in the Heeringa case, but nothing conclusive.
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.
Heeringa's family and friends were posting missing posters around the area, and a Facebook page was set up for people to offer clues or support.
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.
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