UNITED NATIONS Stepping up its relief operations, the World Food Programme has supplied life-saving rations to more than 2.5 million people so far in flood-battered Pakistan, a UN spokesman said Monday. At a news briefing at UN Headquarters in New York, spokesman Martin Nesirky also renewed the world bodys appeal for 40 additional helicopters to enable UN cover all the 20 million people uprooted by the natural disaster, including the 800,000 who can only be reached by air. He said there had been as yet no response to the UN appeal, which was made last week. In London, an aid agency said more than 100,000 heavily pregnant women face the risk of infection and disease in the aftermath of the flooding. The Save the Children said at least half a million expectant mothers had been affected by the floods, with tens of thousands of newborn babies and women in potential danger in the coming months. It added many expectant mothers would be forced to give birth in temporary shelters or tents, with no access to clean water or healthcare.