Nigeria: Hundreds of thousands in need of aid as flooding wipes out homes - WFP / Sudan: First WFP trucks cross into Darfur / From Zambia to Afghanistan, WFP warns El Nino's extreme weather is causing a surge in hunger / Russia to step down from WFP Executive Board -- permanent representation / WFP chief McCain calls on world not to forget Sudan and other countries, amid focus on Gaza / Yemen: Killing of veteran WFP staff member ‘an unacceptable tragedy’