The Latest: Students dismissed after ammunition found

MISSOULA, Mont. (AP) — The Latest on authorities finding ammunition in a Missoula school (all times local):1:15 p.m.

Officials in a Montana high school have dismissed students early to conduct a thorough search of the school after a magazine of ammunition was found in a hallway.

Authorities say a handgun was not found in an initial search of Sentinel High School in Missoula on Monday.

Missoula Police Sgt. Travis Welsh says a construction worker found the ammunition magazine Monday morning and turned it in to school officials.

They immediately imposed a lockdown, which prevents anyone from entering or leaving the school and keeps students in their classrooms.