The US military has begun airdropping food and water supplies into earthquake-hit Haiti. Some 14,000 ready-to-eat meals and 15,000 litres of water were dropped north-east of the capital Port-au-Prince. The US said, more than 2,000 US Marines are set to join 1,000 US troops in Haiti. They are equipped with heavy-lifting and earth-moving equipment, a dozen helicopters and medical support facilities. Their arrival comes amid widespread violence and looting. However, UN humanitarian chief John Holmes played down worries over security, saying that despite incidents of violence, the overall situation was calm. Aid workers are starting to expand their efforts to earthquake-affected areas outside the capital, including Leogane, Gressier, Petit-Goave and the coastal town of Jacmel. Former US President Bill Clinton, who is a UN special envoy for Haiti, yesterday said co-operation between American and UN troops was improving the earthquake relief effort.UN spokeswoman Elisabeth Byrs said 90 people have been pulled out alive since the earthquake and rescue efforts were now concentrated outside of the capital. At least 70,000 people who died in the earthquake have already been buried.Meanwhile, Haitian President Rene Preval has asked donors also to focus on Haiti's long-term needs.