Those who are forced to make changes or be extra-vigilant as a result or the increase sometimes refer to the new era as the '' " security age . " '' Institutions which often increase security in response to perceived risks include airports , government buildings , international borders , hospital , schools , religious institutions , and tourist attractions . The September 11 attacks on the World Trade Center in 2001 resulted in security being greatly increased around the world
September 11 attacks
September 11 attacks
Security increase