UN and aid agencies warned Thursday that they faced a 'major logistic challenge' in getting essential relief to survivors of Haiti's deadly earthquake. Some aid is being handed out, with World Food Programme spokesman Charles Vincent saying 2,400 people in some districts of the flattened Haitian capital Port-au-Prince should receive food later Thursday. 'Obviously it's a drop in a bucket but it's a start,' he said, adding that once roads are cleared, distribution would also start in other areas. 'Most of the population have not had food for the whole day yesterday and today, as a result a certain insecurity is feared.' The scale of devastation caused by Tuesday's 7.0-magnitude quake means the WFP has been unable to gain access to its warehouses, and Vincent said he was unsure if they had been damaged or looted. Elisabeth Byrs, who is spokeswoman of the UN's Office for the Coordination of Humanitarian Affairs, warned that relief agencies faced a 'major logistic challenge' on the ground. While the airport at Port-au-Prince was functioning, its control tower was still down, she said. UN experts are trying to get the control tower operational by 'the end of the day,' Byrs added, and others have been sent to reestablish communications which have been cut off. 'Communications is still the greatest handicap for everybody,' according to the WFP's Vincent. 'Hopefully over the next few days, communications will be restored.' The International Telecommunications Union said later Thursday that it was deploying 40 basic satellite terminals and another 60 terminals with broadband facility to help reestablish communications in Haiti. Experts are also being despatched to help operate the satellite units, added the UN's telecommunications agency. Pledging that the ITU would 'do everything possible to provide assistance ... by reestablishing telecommunications links,' the agency's chief Hamadoun Toure also called on telecommunications companies to pitch in. Earlier the International Organisation for Migration appealed for tents to shelter homeless survivors and said it was was gearing up to distribute vital supplies. 'What we need is tents, tents and more tents. We need large or individual tents, whatever is available, and financial support quickly,' Vincent Houver, the IOM's chief of mission in Haiti, said in a statement. The organisation said it would provide tarpaulins, plastic sheeting, jerry cans and water containers from stocks already in the impoverished vountry to help some 10,000 families. Aid agencies have also been despatching personnel to Haiti, including the Red Cross, which said ten teams are on their way to join in relief efforts. The teams, which include about 100 people from Red Cross societies around the world, should arrive Thursday in Port-au-Prince, said Jean-Luc Martinage, spokesman of the International Federation of Red Cross and Red Crescent Societies. They include an evaluation team which would assess the shelter, water, sanitation and communications needs on the ground, he told selfnews. Haiti's prime minister has warned the death toll could top 100,000, while President Rene Preval said 50,000 could have been killed. 