A 9.1-magnitude earthquake on 26 December 2004 caused a tsunami which hit a dozen countries and killed some 220,000 people. Our colleagues at France 2 take a look back at the unprecedented tragedy and some the lessons learnt.

Survivors and victims' relatives will this week mark the 20th anniversary of the 2004 Indian Ocean earthquake and tsunami, which killed more than 220,000 people across more than a dozen countries.At the time of the earthquake,

Thailand marks 20 years since the 2004 Indian Ocean tsunami A 9.1 magnitude earthquake struck off the coast of the Indonesian island of Sumatra on Dec. 26, 2004, triggering a tsunami that killed around 230,