Here is the latest Iowa news from The Associated Press

WINTERSET, Iowa (AP) — Democratic presidential candidate Hillary Rodham Clinton said she never knowingly sent or received classified information using her private email server and did not know what messages were being cited by intelligence investigators as examples of emails containing classified information. Clinton spoke briefly Saturday about the email matter after a Democratic gathering at the Madison County Historical Complex.

MASON CITY, Iowa (AP) — Mason City Schools plans to implement a new grading system for its elementary students in kindergarten through sixth-grade this fall. The Globe Gazette reports that instead of receiving a letter grade, students will receive proficiency ratings for their knowledge of specific items. The district’s executive director of educator quality and leadership, T.J. Jumper, says the standards-based scale will be more detailed, with ratings ranging from “emerging” to “advanced.”

ALTOONA, Iowa (AP) — A popular phone gadget that’s been banned from amusement parks throughout the country has now been banned in Adventureland Park in Altoona. Des Moines television station KCCI says selfie sticks weren’t just becoming a safety concern for people trying to use them on rides. Adventureland spokeswoman Molly Vincent says guests often complained about people using them during shows and walking with them in crowded areas.

DAVENPORT, Iowa (AP) — Police say a 62-year-old Davenport man who was stabbed last week has died. The Quad-City Times reports that Claude Hanson died Tuesday at Genesis Medical Center-East in Davenport. Police say arrests have been made, and detectives continue to investigate.