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

COUNCIL BLUFFS, Iowa (AP) — Authorities say a 15-year-old Nebraska boy has died in a western Iowa lake. Council Bluffs Assistant Fire Chief Derrick Williams says witnesses saw the Omaha boy disappear beneath the water shortly before 1 p.m. Monday at Lake Manawa. The boy had gone to Lake Manawa State Park in Council Bluffs with two siblings. Williams says the boy was last seen on an inner tube near the ropes that mark the end of the swimming area.

SPARTA, Wis. (AP) — Police say the Iowa man accused of making threats to kill estranged relatives at a high school graduation in Wisconsin has been arrested. The Sparta Police Department said Benjamin Sidie was taken into custody by Dubuque, Iowa police on Monday. School district officials in Sparta decided to cancel Friday’s graduation because of the alleged threats.

IONIA, Iowa (AP) — Authorities say a 17-year-old has died while swimming in a northeast Iowa park. The Chickesaw County sheriff’s office says Samuel Hake, of Nashua, died on Saturday at Chickesaw Park. Hake was an 11th grader at Nashua-Plainfield High School. Authorities have given few details on how Hake died, and are still investigating his death.

WATERLOO, Iowa (AP) — Two people have died in an eastern Iowa crash involving a car and a motorcycle. Authorities say officers responded to the crash in Waterloo around 5:40 p.m. Saturday. The driver of the motorcycle and a passenger in the car died at the scene. The car’s driver was taken to the hospital with serious injuries.