||A worldwide aid effort in the aftermath of the Indian Ocean tsunami means supplies are pouring into the region. They include food, water, shelter, blankets and basic medicines.
Aid agencies are co-ordinating the delivery of relief, beginning with aircraft and ships bringing in large consignments which are then broken down and distributed by road or helicopter.
But getting aid to the worst hit areas is proving difficult. Many roads and airstrips have been damaged, flooded or blocked by debris.
Bridges and harbours have also been washed away.
Even when planes have room to land, local air traffic control systems can be in disarray. Because of their versatility, helicopters are a vital part of the relief effort.