UPDATED: 11:15 a.m.
The source added that the armed man came through a security guard station around 8:30 a.m., and there was some kind of altercation. During that confrontation, the guard tripped a panic button, alerting day-shift employees of an emergency, which summoned police.
The armed man then ran through the facility and found the ex-girlfriend and another woman. He is currently holding them hostage.