The Asian tsunami that crashed into coastal communities around the Indian Ocean on Dec. 26, 2004, is this century’s deadliest natural disaster so far.

Survivors and mourners gathered at mass graves in Indonesia, Thailand and other places along the Indian Ocean that were devastated by the 2004 tsunami — the deadliest in the world.

Yesterday, communities along Thailand’s Andaman coast held ceremonies to commemorate the 20th anniversary of the 2004 tsunami.