KNIA/KRLS listeners in the southern part of Marion County told our news staff about loud, low-flying planes in their area last night. It turns out that those planes were part of an Iowa Air National Guard training exercise. The Iowa Air National Guard tells KNIA/KRLS News that a group of F-16s were practicing flying maneuvers over parts of south central Iowa yesterday, including in Marion County. They add that those exercises may continue this evening as well.