LOG: 415 ENTRY: ___ INCIDENT CODE: 4-9-9-5 A CAUSE OF INCIDENT: UNKNOWN INCIDENT REPORT SUMMARIZATION TO DATE: 4:38 AM, 06/19/15 - Reports of suspicious activity throughout Facility-___. Sudden creaks and shakes rumble throughout ventilation systems. Facility Engineers are soon to be sent to find the cause of the problem, assisted by the Security Department. 10:56 AM 06/19/15 - Suspected activity came to a stop, SD members wait for Team A to return 11:12 AM 06/19/15 - Team A did not return. At least fifteen unknown personnel existed in the ventilation system. 1:05 PM 06/19/15 - Facility on lockdown -- END OF REPORT