Dubai: Osama bin Laden has expressed concern about global climate change and flooding in Pakistan, in an audiotape aired on the Internet, his first public remarks since March, a monitoring group said

The World Bank has announced a grant of $900 million for relief and reconstruction work following the floods in Pakistan that have cost the nation around Rs 250 billion, a media report said on Friday.

The US has announced $25 million aid for the flood relief work in Pakistan, taking the total humanitarian fund to the inundation ravaged nation to $35 million.

Pakistan issued new flood warnings on Tuesday as more rains fell and rising water levels threatened to overwhelm one of the country's biggest dams.