Here is the latest Iowa news from The Associated Press at 3:40 a.m. CDT

BROOKLYN, Iowa (AP) — The mother of a missing Iowa college student is pleading with anyone who may have abducted her to let her daughter go and claim a fast-growing pot of reward money. Laura Calderwood said Thursday that she believes her daughter, 20-year-old Mollie Tibbetts, is still alive but potentially kidnapped. She says it’s the family’s greatest hope that whoever may have Tibbetts lets her go and claims the “money we have raised for her freedom.”

WATERLOO, Iowa (AP) — More than 200 people filled an amphitheater in Waterloo to draw attention to missing persons cases and demand justice for the slain. The Waterloo-Cedar Falls Courier reports that Wednesday’s vigil was organized by the Family and Children’s Council of Black Hawk County. It aimed to bring awareness to missing and unsolved crimes involving young people.

MASON CITY, Iowa (AP) — Officials in northern Iowa are looking for a work release prisoner who walked away from a residential facility without permission. Prison officials say 29-year-old Matthew Ernest Andersen left the Beje Clark Residential Facility in Mason City on Wednesday night and did not return.

CEDAR RAPIDS, Iowa (AP) — A Cedar Rapids man has been accused of producing child pornography and threatening to distribute the depictions. Federal court records say 34-year-old John Hunt has pleaded not guilty to one count of sexual exploitation of a child and one of extortion and four counts of child pornography possession.