SIOUX CITY, Iowa (AP) — Authorities in northwest Iowa say freezing weather may have caused a pipe at a community college to break and flood some classrooms. The Sioux City Journal) reports students and staff were evacuated after the Monday morning flooding at Western Iowa Tech Community College. Officials say the pipe spewed water into a hallway and later spread into a manufacturing lab. The broken pipe also activated the building’s fire alarm because of a drop in pressure to the school’s sprinkler system. Classes were canceled for rooms affected by the flooding. They were expected to resume Tuesday.