The death toll is still spiralling upwards and mass graves are being dug even as people hunt for the missing. Surely nothing matters more right now, than an active and prayerful response from each one of us. The extent of the damage is still not known in areas worst hit, including Sri Lanka, Indonesia, India and Thailand.

• PRAY FOR A SPEEDY RESPONSE AND FOR GOOD WEATHER CONDITIONS...

Survivors may have little clean water or sanitation as they try to build shelters and bury the dead after Sunday's 9.0 magnitude earthquake sent huge waves from Malaysia to Africa.

DISASTER TOLL Sri Lanka: 13,000 dead Indonesia: 4,500 dead India: 3,500 dead Thailand: 866 dead Maldives: 52 dead Malaysia: 44 dead Burma: 30 dead Bangladesh: 2 dead   Eyewitness accounts In pictures: Quake disaster At-a-glance: Countries hit

"This may be the worst natural disaster in recent history because it is affecting so many heavily populated coastal areas... so many vulnerable communities," UN emergency relief co-ordinator Jan Egeland told CNN.

In northern Indonesia, nearest to the epicentre of the undersea quake, the vice-president said he feared fatalities in the worst-hit province of Aceh could rise as high as 20,000.

Jusuf Kalla appealed for urgent international aid. "It's very, very bad," he told reporters after a trip to the area. "We need help fast."

The number of dead has also soared well into the thousands in Sri Lanka and India, and thousands more may have been killed on the Andaman and Nicobar islands where reports say entire communities were swept into the sea.

Thousands are missing and many more thousands forced from their homes by the worst earthquake in 40 years that generated a wall of water speeding across the oceans.

EARTHQUAKE EXPLAINED Click below to see how the disaster unfolded In graphics

"The scale of the tragedy is massive and Sri Lanka... has never been hit by tidal waves or earthquakes in its known history," President Chandrika Kumaratunga told the BBC.

Searches have also been continuing off southern India for those swept away from beaches or in fishing boats.

GIANT EARTHQUAKES 1960 - Chile, 9.5 magnitude 1964 - Alaska, 9.2 1957 - Alaska, 9.1 1952 - Russia, 9.0 2004 - Indonesia, 9.0

In Thailand, bodies were still being taken to makeshift morgues in the resort of Phuket. Many are said to be clad in swimsuits, with people dragged to their deaths as the tsunami smashed into beaches without warning.

PLEASE PRAY FOR THE FOLLOWING AGENCIES...

• The International Monetary Fund promised "whatever possible assistance"
• The Red Cross launched an appeal for 5m euros (£3.5m; $6.8m)
• The European Union pledged 3m euros (£2.1m; $4.1m)
• Australia promised $10m (£4m; $7.7m) and sent two planes carrying drinking water and purification equipment to Indonesia
• Russia sent 25 tons of humanitarian aid to Sri Lanka
• The UK is sending a plane to Sri Lanka with plastic sheeting and tenting
• France will send humanitarian aid and doctors to Sri Lanka and Thailand.

IMPACT OF THE EARTHQUAKE