At least 30,920 people have been killed and 15,573 others injured in the huge tsunami triggered by the powerful earthquake off Indonesia on Dec. 26, according to a report issued Monday by the Center for National Operations Sri Lanka.

The massive tidal waves crashed into the coastal villages over a wide area of Sri Lanka, affecting 201,959 families and leaving 6,020 people still missing.

The huge disaster also completely destroyed 90,241 houses whilepartially battered 41,960. There are still 404 camps in the tsunami-hit areas for refugees.

The quake, measuring 8.7 on the Richter scale by the Chinese State Seismological Bureau, was the strongest over the past four decades, and the fourth-largest in a century.