Following the February 2011 earthquake, a cordon closed off most of Christchurch's central city. A monitored pass system was implemented by CERA to provide limited, safe access to business owners, tenants and residents. The cordon was regulated by the New Zealand Defence Force with support from the New Zealand Police. As dangerous buildings were demolished or made safe, and aftershocks decreased, controlled access was allowed for the general public. This was considered to be an important step in the city's psycho-social recovery.