A local policeman stands guard while residents try to cross the border between Haiti and Dominican Republic at the zone known as Malpasse February 1, 2010. Aid groups and troops from around the world have struggled to distribute food, water and medical care to an estimated three million Haitians injured or left homeless in the 7.0-magnitude earthquake that wrecked much of Haiti's capital on Jan. 12, killing as many as 200,000 people. REUTERS/Kena Betancur (HAITI - Tags: DISASTER)