NEW YORK (AP) — Officials continue to urge students and others not to wander on campus grounds . NMU put the campus on lockdown early Wednesday because of threat against students , others . Public schools in Marquette were also closed , the interim superintendent says .
NEW : Northern Michigan University police say situation is under control . Officials continue to urge students and others not to wander on campus grounds . NMU put the campus on lockdown early Wednesday because of threat against students , others . Public schools in Marquette were also closed , the interim superintendent says .