Here is the latest Iowa news from The Associated Press…

DES MOINES, Iowa (AP) — An overnight freeze warning is in effect for central, south central and southeast Iowa and weather officials say minor snow could fall in the northwest part of the state. The system early Wednesday is expected to produce light rain across the southwest half of the state and possibly a dusting of snow to the northwest.

MASON CITY, Iowa (AP) — A Mason City man convicted in connection with his son’s death has had his request for a new trial rejected. The Globe Gazette reports that 30-year-old Kenneth L. Adams was convicted of child endangerment in the October 2012 death of his 18-month-old son. Prosecutors say Adams put the boy face down in a pillow, cutting off his breathing.

JEFFERSON, Iowa (AP) — Suspicious fires in a school bus and building in the central Iowa city of Jefferson are being investigated by the State Fire Marshal’s office. KCCI-TV reports that the bus that burned was in a school district parking lot where it had been locked. The other fire was in a 3½-story building being used to store tools. That structure was heavily damaged.

CARTER LAKE, Iowa (AP) — An Iowa official says there’s no easy solution or quick fix to a persistent algae problem at a lake in western Iowa. Chris Larson with the state Department of Natural Resources told the Carter Lake City Council that unusual weather conditions over the last three years have made it difficult to clean up Carter Lake. Larson said routine maintenance from the city’s mechanical harvesters may be the best long-term solution for the lake.