The September 2010 Canterbury earthquake caused damage to some buildings, but the Boxing Day aftershock, directly underneath the city, caused even more damage, including building failures. The 6.3 magnitude February 2011 Christchurch earthquake devastated the mall; the façades of many buildings collapsed and there were several fatalities. The centre of the city was subsequently closed to allow demolition work to proceed. Structures affected included most of the heritage buildings in the mall that are or were registered by Heritage New Zealand. Part of City Mall, the section of Cashel Street from Oxford Terrace to Colombo Street, was the first part of the central city to open again, on Saturday, 29 October 2011, marked by a ceremony at which the Prime Minister John Key officiated.