People of different nationalities gather at a station as they leave Abidjan, Ivory Coast. Rebel forces backing Ivory Coast's internationally recognized president were advancing toward the capital Wednesday after seizing two more towns in the center of the country. (Photo: AP Photo/Emanuel Ekra)

ABIDJAN, Ivory Coast (AP) — Rebels fighting to install Ivory Coast's democratically elected president began besieging the main city of Abidjan on Thursday after seizing a key seaport overnight and the hometown of the country's entrenched ruler.

United Nations radio announced that the port of San Pedro, 190 miles (300 kilometers) west of Abidjan, was taken late Wednesday. Residents said by telephone that soldiers retreated in trucks while firing into the air as the rebels moved into San Pedro.

In Abidjan, rebels already in control of several northern districts of the city attacked a prison and freed the inmates, a rebel commander said.

The rebels, who support internationally recognized leader Alassane Ouattara, also advanced into Yopougon, a district of Abidjan that fervently supports incumbent president Laurent Gbagbo, witnesses said.

Advancing on foot while firing into the air, the rebels set up roadblocks on one of Yopougon's main thoroughfares and have been battling with police since early Thursday morning, said a local resident who asked not to be named for fear of reprisals.

Across town in the predominantly pro-Ouattara Adjame district, several residents reported that pro-Gbagbo militiamen were firing weapons, though it was unclear at what.

The rebels have seized over a dozen towns since beginning their offensive on Monday, and the fall of the cocoa-exporting port of San Pedro came hours after they took the capital, Yamoussoukro. There, they did a victory lap in vehicles as people cheered and clapped.

They have faced almost no resistance but many fear that army troops still loyal to Gbagbo plan to make a final stand in Abidjan, the country's economic hub and where the presidential palace is located.

The rebel army is on the periphery of Abidjan, said a close aide to Ouattara, who was recognized by governments around the world as the country's legitimate president after winning last November's presidential election.

"They will enter the city on multiple fronts, from multiple directions," said the adviser, who asked not to be named because he is not authorized to speak to the press. Rebels overnight took Gbagbo's hometown, the village of Mama, where the former president had built a lavish villa, the aid said.

"The rebels slept in Gbagbo's bed," he said.

Outtara's whereabouts were not immediately known. He had been holed up for months in the lagoonside Golf Hotel in Abidjan, protected by United Nations peacekeeping troops. Ouattara, who is from the country's north, had long tried to distance himself from the rebels based there who fought in a brief civil war almost a decade ago that left the country split in two.

On Wednesday, the U.N. Security Council unanimously demanded an immediate end to the escalating violence and imposed sanctions on Gbagbo, who has refused to relinquish the presidency, and his inner circle.

Up to 1 million people have fled the fighting. At least 462 people have been killed since the election.

Gbagbo and Ouattara two men have vied for the presidency for months, with Ouattara using his considerable international clout to try to financially and diplomatically suffocate Gbagbo. After the final round of diplomatic efforts had failed to remove Gbagbo, the rebels launched a dramatic offensive this week, seizing control of the country from the west, the center and the east.

Seydou Ouattara, a spokesman for the rebels who is not related to the political leader, said that they faced so little resistance from Gbagbo's forces because Gbagbo had tried to neuter the army. Diplomats and human rights groups have said that Gbagbo has enlisted Liberian mercenaries and has armed militias, because he did not trust the regular army.

"He recruited mercenaries. He recruited militias. He essentially told the army we have no confidence in you. We were able to use this to our advantage," said Seydou Ouattara. "In each town, we told the soldiers, we are your brothers. We want the same thing."

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Associated Press writer Michelle Faul in Johannesburg contributed to this report.