Rescue workers are continuing to search for survivors after an earthquake killed more than 4,500 people on Indonesia’s Java island.Up to 20,000 people have been injured and more than 100,000 others are thought to be homeless, according to UNICEF, the U.N. Children’s Fund. The 6.2 magnitude quake struck the ancient city of Yogyakarta at dawn on Saturday morning. To help the relief effort, trucks full of volunteers as well as military vehicles carrying soldiers have been heading south to Yogyakarta and Bantul, hardest hit by the quake. More than 2,000 people died there and most buildings in the area have been flattened and replaced by makeshift plastic tents along the roads. Throughout the disaster-struck region, authorities are struggling to deliver aid. Clean water is another problem. In Bantul, all 12 water distribution systems have been either knocked out completely or are not working properly. The international community has rallied to help Indonesia, offering medical relief teams and emergency supplies. Britain has offered four million euros in aid while the EU is sending three million to help the immediate need for food and shelter.