Haitian and U.N. officials are appealing for calm following protests by Haitians who have demanded that front-runner Rene Preval be declared the winner of last week's presidential election.
Preval is expected to address Haiti's citizens later Tuesday in Port-au-Prince.
On Monday, protesters set up roadblocks, burned tires and stormed a hotel in Port-au-Prince. At least one man was killed in the violence.
With 90 percent of votes counted, former President Preval has nearly 49 percent of the vote. He needs to exceed 50 percent to win outright and avoid a runoff election. Another former president, Leslie Manigat, is second with about 12 percent.
A State Department spokesman Monday said Secretary of State Condoleezza Rice and U.N. Secretary-General Kofi Annan Monday have discussed the importance of Haitian citizens respecting the election process.
Some information for this report was provided by AP and Reuters.