The government of interim President Roberto Michelleti says in a statement that the curfew started at 4 p.m. Monday and will end at 6 p.m. Tuesday. It initially declared a 15-hour curfew, ending Tuesday morning.
The deposed President Manuel Zelaya made a dramatic return earlier Monday, taking shelter from arrest at Brazil's embassy and calling for negotiations with the leaders who forced him from the country at gunpoint.
Thousands of Zelaya supporters ignored the curfew and remained outside the embassy, dancing and cheering.
Others in the capital rushed home, lining up at bus stands and frantically looking for taxis. Electricity was cut off for hours at a time on the block housing the embassy and in areas of Tegucigalpa where news media offices are located something that happened the day of the coup that ousted Zelaya.
The leftist leader's homecoming creates a sharp new challenge for the interim government that has threatened repeatedly to throw him in jail if he returns.
Chants of "Yes we could! Yes we could!" bellowed from the crowd outside the Brazilian Embassy.
Zelaya told The Associated Press that he was trying to establish contact with the interim government to start negotiations on a solution to the standoff that started when soldiers flew him out of the country June 28.
"As of now, we are beginning to seek dialogue," he said by telephone, though he gave few details. Talks moderated by Costa Rican President Oscar Arias have been stalled for weeks over the interim government's refusal to accept Zelaya's reinstatement.
He also summoned his countrymen to come to the capital for peaceful protests and urged the army to avoid attacking his supporters.
"It is the moment of reconciliation," he said.
Security Vice Minister Mario Perdomo said checkpoints were being set up on highways leading to the capital to keep out Zelaya's supporters from other regions, to "stop those people coming to start trouble."
The interim government was caught off guard by Zelaya's arrival. Only minutes before he appeared publicly at the embassy, officials said reports of his return were a lie.
Zelaya's presence could revive the large demonstrations that disrupted the capital following the coup and threatens to overshadow the presidential election campaign.
Teachers union leader Eulogio Chavez announced that the country's 60,000 educators would go on strike indefinitely Tuesday to back Zelaya's demand to be reinstated.
U.S. Secretary of State Hillary Rodham Clinton urged both sides to look for a peaceful solution to the crisis.
"It is imperative that dialogue begin, that there be a channel of communication between President Zelaya and the de facto regime in Honduras," Rodham Clinton told reporters on the sidelines of the annual U.N. General Assembly session in New York.
The U.S. State Department announced Sept. 4 that it would not recognize results of the presidential vote under current conditions. The coup has shaken up Washington's relations with Honduras, traditionally one of its strongest allies in Central America.
The secretary general of the Organization of American States, Jose Miguel Insulza, called for calm and warned Honduran officials to avoid any violation of the Brazilian diplomatic mission. "They should be responsible for the safety of president Zelaya and the Embassy of Brazil," he said.
Brazilian Foreign Minister Celso Amorin said neither his country nor the OAS had any role in Zelaya's journey before taking him in.
"We hope this opens a new stage in negotiations," Amorin said. He also warned: "If something happens to Zelaya or our embassy it would be a violation of international law," which bars host countries from arresting people inside diplomatic missions.
Honduras' Foreign Relations Department criticized Brazil, saying it was violating international law by "allowing Zelaya, a fugitive of Honduran justice, to make public calls to insurrection and political mobilization from its headquarters."
Micheletti urged Brazil in a nationwide radio address to turn Zelaya over to Honduran authorities.
In the days following the coup, at least two of the thousands of demonstrators who took to the streets were killed during clashes with security forces. Thousands of other Hondurans demonstrated in favor of the coup.
The country's Congress and courts, alarmed by Zelaya's political shift into a close alliance with leftist Venezuelan President Hugo Chavez and Cuba, backed Zelaya's removal.
He was arrested on orders of the Supreme Court on charges of treason and abuse of power for ignoring court orders against holding a popular referendum on reforming the constitution.
Micheletti said Zelaya sought to remove a ban on re-election grounds for immediate removal from office under the Honduran constitution. Zelaya denies any such plan.
International leaders were almost unanimously against the armed removal of the president, alarmed that it could return Latin America to a bygone era of coups and instability. The United States, European Union and other agencies have cut aid to Honduras to press for his return.
Zelaya said he had "evaded a thousand obstacles" to return, traveling 15 hours by land in different vehicles. He declined to give specifics on who helped him cross the border, saying that he didn't want to jeopardize their safety.
His staunch supporter, Chavez, described the journey: "President Manuel Zelaya, along with four companions, traveled for two days overland, crossing mountains and rivers, risking their lives. They have made it to Honduras."
If the interim administration attempts to imprison Zelaya, protesters who have demonstrated against his ouster could turn violent, said Vicki Gass at the Washington Office on Latin America.
"There's a saying about Honduras that people can argue in the morning and have dinner in the evening, but I'm not sure this will happen in this case," said Gass. "It's been 86 days since the coup. Something had to break and this might be it."