The first giant waves from the Indian Ocean tsunami reached Banda Aceh, an Indonesian city of about 300,000 people, within 15 or 20 minutes of the earthquake.
Few residents of the densely populated area realised that the earthquake they had felt could cause a tsunami, and there was little time to flee to higher ground. Travelling as fast as 800 kilometres per hour, the waves spread to other countries, including India, Myanmar, Sri Lanka and Thailand.
With no warning, coastal populations were caught by the pounding waves. Many families that made their living fishing lost everything; the tsunami wiped out whole communities.