Security footage has been released showing the moments when the 8.8-magnitude earthquake struck central Chile. It is now confirmed that at least 147 people have died. Many buildings have collapsed and several areas are without power. A 'state of catastrophe' has been declared after what was the most destructive quake in fifty years. Countries in the Pacific Rim are on tsunami alert - warning sirens are sounding in Hawaii, while Samoa has evacuated its coast.