Here is the latest Iowa news from The Associated Press

OMAHA, Neb. (AP) — Grocery distributor Nash Finch Company says its subsidiary U Save Foods Incorporated has agreed to buy Omaha-based No Frills Supermarkets. The deal adds 18 stores to the Nash Finch company. Fourteen are located in Nebraska, 12 of which are in the Omaha market. Four stores are located in western Iowa.

MASON CITY, Iowa (AP) — No injuries have been reported from an explosion at a biodiesel plant in Mason City. The Globe Gazette in Mason City reports the explosion happened late yesterday afternoon at the Soy Energy plant on the city’s southwest side. The explosion was reported about 6 p.m. yesterday.

ELKADER, Iowa (AP) — An Iowa teenager accused of killing his grandparents at their home in Manchester has been formally charged with two counts of first-degree murder. 17-year old Isaiah Sweet made his initial court appearance on Tuesday in Clayton County District Court in Elkader. He’s charged in the deaths of Richard and Janet Sweet. Their bodies were found Sunday afternoon when relatives arrived for a Mother’s Day gathering.

PEOSTA, Iowa (AP) — Workers at a printing company may have to return to college for a spelling refresher. Because of an error, hundreds of Northeast Iowa Community College diploma covers featured a misspelling — the state was spelled “Ioma.” Tracy Kruse, the college’s director of external relations, said the error wasn’t noticed until shortly before last week’s ceremonies at the Peosta and Calmar campuses. About 300 graduates saw the misspellings.

CEDAR FALLS, Iowa (AP) — Authorities say a former employee has been charged with stealing over $13,000 worth of artifacts from the Cedar Falls Historical Society museum. Police say 58-year-old David Arnold of Waterloo, was arrested yesterday for first-degree theft. He was taken to the Black Hawk County jail. The museum reported the theft on April 25th.

SIOUX CITY, Iowa (AP) — The hiring of a new Sioux City West High School boys and girls track coach based on tenure has raised complaints that the district may have overlooked better qualified candidates. Bruce Lear, director of the teachers union, says the district had to hire Rochelle Babcock in accordance with the union’s contract language on tenure and the district should have never suggested others would be interviewed.

IOWA CITY, Iowa (AP) — An environmental research center at the University of Iowa has received a $7.9 million grant to help support research of rural health issues. The Iowa City Press Citizen reports that the Environmental Health Sciences Research Center is getting a five-year grant from the National Institute of Environmental Health Sciences. The center has 65 faculty researchers and was founded in 1990.