ISLAMABAD, Pakistan (AP)  United Nations Secretary General Ban Ki-moon said Sunday that he had never seen anything like the flood disaster in Pakistan and urged foreign donors to speed up assistance to the 20 million people affected.

“I will never forget the destruction and suffering I have witnessed today,” Mr. Ban said after flying over hard-hit areas with President Asif Ali Zardari. “I have witnessed many natural disasters around the world, but nothing like this.”

Image A helicopter dropped relief supplies for flood victims in Pakistan’s Punjab province on Sunday. Credit... Adrees Latif/Reuters

The secretary general visited Myanmar after Cyclone Nargis struck there in May 2008, killing an estimated 138,000 people. Two months earlier, he flew to Sichuan Province in China, just days after an earthquake killed nearly 90,000 people.