Updated

Critics of Haiti's President Michel Martelly and his government are protesting once again as thousands of people march through the capital and other cities.

The demonstrators from opposition parties are calling for the departure of Martelly because they say he hasn't been an effective leader.

The march began peacefully. But there have been fears that it could turn violent. A protest earlier this month ended with unknown individuals firing into crowds.

The U.N. peacekeeping mission in Haiti has called for Martelly and opposition parties to sort out their differences in a peaceful manner. The world body also dispatched armed troops for the demonstration.

The protest began in downtown Port-au-Prince on Monday morning, a national holiday. Demonstrations are also happening in the cities of Cap-Haitien and Les Cayes.