Haiti's complex humanitarian emergency requires urgent attention and strategies beyond emergency response, three senior United Nations and European Union officials said on Monday as they wrapped up a four-day visit to the Caribbean nation. As clashes continue in Haiti, more than 578,000 Haitians, including 300,000 children, are internally displaced, and some 4.97 million people face acute hunger - nearly half the population - with 1.64 million women, children and men at risk of starvation.