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Dieu Nalio Chery, Associated Press
National police officers clear a burning barricade during a protest against President Michel Martelly's government to demand the cancellation of the Jan. 24, elections, in Port-au-Prince, Haiti, Tuesday, Jan. 19, 2016. Disputed election results have brought paralyzing street protests and many broad accusations of electoral fraud from civil society and opposition groups.

PORT-AU-PRINCE, Haiti — For a second straight day, opposition protesters erected burning roadblocks and shattered windows in a section of Haiti's capital Tuesday to press for new elections less than a week before a Jan. 24 presidential and legislative runoff.

A few thousand people joined the demonstration in downtown Port-au-Prince, marching through narrow streets and occasionally chanting: "The revolution has started, get your gun ready." Young men threw rocks, smashing windshields and the windows of a bank. They also overturned vendors' roadside stalls to block law enforcement vehicles.

Associated Press journalists saw one protester with a bullet wound. Demonstrators said a police officer shot him in the leg, but the details of the shooting were unclear. At least one law enforcer was injured by a hurled rock that hit his head.

Campaigning for Haiti's presidential runoff kicked off earlier this month, but only government-backed candidate Jovenel Moise is participating. Opposition presidential candidate Jude Celestin is boycotting the Jan. 24 vote, arguing he has no chance to win because the deck is stacked against him by Haiti's electoral machinery and interference by the international community.

Celestin leads an opposition alliance alleging "massive fraud" in favor of Moise, outgoing President Michel Martelly's chosen successor. Moise won nearly 33 percent of the vote in the disputed Oct. 25 first round.

Ernest Casseus, an unemployed 57-year-old from a downtown neighborhood of concrete shacks and trash-strewn streets, insisted that the runoff had to be postponed to protect democracy in the nation that has endured coups and dictatorships for most of its history.

"It's like a football game: You need two teams to play or you have no finals. A presidential election with one candidate is crazy and will only result in chaos," he said during Tuesday's opposition protest, one of a series during so-called "rebellion week."

The Haitian National Police dispersed the demonstrators with tear gas before they arrived at Haiti's Parliament, where senators were discussing a resolution to potentially postpone Sunday's vote and set up a verification commission. Lawmakers in Haiti's upper house, where no political faction dominates, expect to vote on the matter Wednesday.

Haiti's influential Chamber of Commerce issued a Tuesday statement said it was concerned about the electoral crisis and called for a recent special commission's recommendations to be adopted, including the redesign of Haiti's much-criticized Provisional Electoral Council.

But outgoing President Michel Martelly told reporters at a Tuesday conference of visiting foreign ministers that he was ready to vote Sunday and would ensure that security was in place to ensure safe balloting for citizens. Martelly, who is barred from seeking a consecutive term and is due to leave office Feb. 7, argues that the opposition has spread unsubstantiated allegations about "massive fraud" to improve their chances at gaining power.

Electoral council authorities have also insisted that the vote will take place as scheduled. They say Celestin's name and photo will appear on ballots because he never officially withdrew from the race.

The United Nations, the United States and the OAS have said they support holding the final round this month so a transfer of power to a new leader can take place by the Feb. 7 constitutional deadline.

But over 40 Haitian-American groups and various community leaders wrote to U.S. Secretary of State John Kerry criticizing the "unhelpful role the State Department has been playing in Haiti's election crisis." They called on Washington to support a Haitian-led investigation into alleged electoral fraud.

David McFadden on Twitter: http://twitter.com/dmcfadd