(CNN) -- The death toll from massive floods in Pakistan rose to 1,497 on Friday as U.N. chief Ban Ki-moon said the crisis is a "slow-motion tsunami" that is expected to grow.
The number of homeless as a result of flooding has doubled to 4 million.
Ban urged the international community to give more aid during a special fundraising meeting Thursday night.
"Make no mistake," he said. "This is a global disaster, a global challenge. It is one of the greatest tests of global solidarity in our times".
The U.N. secretary-general, who traveled to Pakistan last weekend to visit sites devastated by the disaster, said almost 20 million people need shelter, food and emergency care.
"That is more than the entire population hit by the Indian Ocean tsunami, the Kashmir earthquake, Cyclone Nargis, and the earthquake in Haiti -- combined," he said.
The United Nations has already appealed for $460 million over the next three months, Ban said, and although donors delivered more than a half, the available resources are not sufficient to meet the needs on the ground.
The European Commission has pledged 40 million euros ($51 million) since July 31 for the flood victims. It said it will mobilize an additional 30 million euros (about $38 million). CNN
