Pakistan Floods - Desperate Refugees Fight Over Food

Protective A woman holds her son tight as she crosses a damaged bridge in Kasbag Gujarat

Catastrophic The flooding is officially the worst disaster in Pakistan's history

Temporary structure Residents cross a bridge built by the army in the flood affected area of Kasbag Gujarat

Displaced Vehicles lie on their side as people flee the flooded areas around Basera, near Muzaffargarh

Humanitarian crisis People displaced from flooded areas jostle for a bag of donated wheat flour in Shah Jamal, near Muzaffargarh (above), while a frightened woman braves the crush by an aid truck (below)

More than four million Pakistanis have been made homeless by nearly three weeks of floods, the United Nations said on Thursday, making the critical task of securing greater amounts of aid more urgent.

Desperate Refugees fight to get food donated by a local charity in the village of Karamdad Qureshi in Punjab province. Some 20million people have been affected by the worst flooding in Pakistan's history

Tired, desperate and starving, these two men come to blows as they fight over a food package handed out by a local charity.With more than 20million people displaced by flooding that is now officially the worst disaster Pakistan has ever faced, the humanitarian crisis has only just begun.

Pakistani women and children wait to be given a fresh meal at a camp for families displaced by floods run by the Pakistan Air Force in Sukkar, Sindh province, southern Pakistan, Saturday, Aug. 21, 2010. (AP Photo/Kevin Frayer)

A Pakistani baby opens her mouth as her mother drops water to keep her from dehydration at an evacuation center for flood victims in Multan, Pakistan on Sunday Aug. 22, 2010. The world has given or pledged more than $800 million to help Pakistan cope with massive floods, Pakistan's foreign minister said Sunday, as a surging river in the south led authorities to urge thousands more people to evacuate. (AP Photo/Aaron Favila)