Haitians pray during a prayer vigil in the street in Port-au-Prince
Haitians pray during a prayer vigil in the street in Port-au-Prince February 2, 2010. The aid operation in Haiti has been complicated and frustratingly slow, but is making significant progress, particularly in getting food to quake survivors, the top U.N. relief official said on Tuesday. REUTERS/Eliana Aponte (HAITI - Tags: DISASTER)