Lockdown

The focus for preventive actions is to avoid dangers and risks arising from the nonconformity to the normal circumstances, but also commonly includes improvements in efficiency.

These protocols must be based on the type of threat, and should be kept simple and short for quick learning and implementation, and flexible enough to handle several scenarios.

They may be use for security purposes to reduce the number of people on the street to allow police to conduct rescue missions after natural disasters.

[18] In US guidelines, occasions for preventing entry into a hospital may include: power failure, earthquake, flooding, fire, bomb threat, hostage crisis and active shooter.

[19][20] Occasions for preventing both entry and exit from a hospital may include: external contamination, civil disturbance and abduction of an infant or child.

During the lockdown event a multi-disciplinary team reviews the specific area's manufacturing processes, tooling and machine condition, to find the root cause(s) of the problem(s).

Once changes to the process, or machine repairs that may include adjustments or replacement are effected, a sample run is initiated and evaluated.

At the University of British Columbia (UBC) on January 30, 2008, an unknown threat was made, and the Royal Canadian Mounted Police (RCMP) issued a lockdown order on one of the buildings on campus for six hours, cordoning off the area.

George S. Henry Academy was locked down in Toronto, Ontario at approximately 2:00 p.m.[24] The ETF were contacted and the lockdown lasted for more than two hours.

New Westminster Secondary School was locked down in New Westminster, British Columbia at approximately 1:40 p.m.[25] The Emergency Response Team (ERT) was called, and the school was under lockdown until 4:30 p.m. Due to the size of the school some students were not able to leave until 7:00 p.m. On April 19, 2013, the entire city of Boston, US was locked down and all public transportation stopped during the manhunt for terrorists Dzhokhar and Tamerlan Tsarnaev, the perpetrators of the Boston Marathon bombing, while the town of Watertown was under heavily armed police and SWAT surveillance, and systematic house-to-house searches were carried out.

[26][27][28] In Belgium, its capital Brussels was locked down in 2015 for days while security services sought suspects involved with the November 2015 Paris attacks.