Updated

The head of the U.N.'s human rights office in Ivory Coast says at least one person was killed and as many as 130 arrested during an early morning raid on the headquarters of a party allied with the internationally recognized winner of last month's presidential election.

U.N. Human Rights Division Director Simon Munzu says he and his staff were barred from entering the building belonging to the party of Henri Konan Bedie on Tuesday hours after the shootout. Witnesses say security forces opened fire with automatic weapons for at least 20 minutes at around 5:30 a.m.

Bedie's party is allied with Alassane Ouattara, who was recognized as the winner of the election but has been unable to assume power because the incumbent president is refusing to leave.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

ABIDJAN, Ivory Coast (AP) — Nigeria's president warned Tuesday that a solution to Ivory Coast's deepening political crisis will take time, after the internationally recognized winner of the election said a military intervention should now be considered to oust the incumbent.

A high-level regional delegation paid renegade leader Laurent Gbagbo a second visit on Monday and urged him to step down, but he rebuffed their appeal. Leaders from the nations of Benin, Cape Verde and Sierra Leone then traveled to Nigeria to meet with Nigerian President Goodluck Jonathan, the current chairman of the 15-nation regional bloc ECOWAS.

"Anything that has to do with crisis in nation, it takes time," Jonathan told reporters in the Nigerian capital of Abuja where meetings were ongoing Tuesday. "Don't expect that if there is a major crisis in a country, you just jump in in one week and the matter is resolved."

ECOWAS and the African Union later released a statement indicating that Gbagbo had "agreed to negotiate a peaceful end to the crisis without any preconditions." But the statement did not elaborate on what actions that would entail other than lifting a blockade around the hotel where his rival is based, and Gbagbo had not relinquished power Tuesday. The statement also called on Gbagbo to hand over power "without further delay."

The regional bloc has threatened to use military force to oust Gbagbo, who has clung to power more than a month after the United Nations said he lost the presidential runoff vote to rival Alassane Ouattara after a decade in power. The delegation's first effort last week to force him into exile failed, and there were no signs that Gbagbo had softened his position after Monday's follow-up meeting.

"For us, the discussion is finished," Ouattara said after meeting with the African leaders on Monday. They had presented Gbagbo with an amnesty deal if he steps down ... ECOWAS will need to use all the means at its disposal including the use of legitimate force so that the president that was elected can assume his functions."

Col. Mohammed Yerima, a Nigerian military spokesman, said defense chiefs from ECOWAS member states met last week to begin strategizing what sort of assault they would use if talks fail. Analysts, though, have questioned how quickly ECOWAS could mobilize a force and whether they could remove Gbagbo without a full-scale invasion resulting in heavy civilian casualties.

Despite increasing international pressure, including visa bans by the European Union and the U.S., Gbagbo has stayed in power with the backing of the army. Human rights groups accuse his security forces of abducting and killing hundreds of political opponents. The U.N. has been barred entry from a building believed to be housing 60 to 80 of the bodies.

Even as Gbagbo's meeting with the African leaders was going on, his closest advisers continued to insist that the 65-year-old had won the election.

Ouattara has been shut out of the institutions of power in Ivory Coast but is attempting to govern from a hotel in Abidjan where he and his staff are barricaded behind sandbags and razor wire. He is protected by United Nations peacekeepers, but Gbagbo's security forces have set up checkpoints on the roads leading to the hotel, barring anyone from entering or exiting.

In recent weeks, getting supplies to the Golf Hotel has become increasingly difficult, and the U.N. started running daily helicopter flights that land on the hotel's lawn ferrying cartons of vegetables and tins of powdered milk.

In Washington, U.S. officials said they remain willing to help Gbagbo make a "dignified exit," including revisiting the visa ban so he can travel to the United States and take up a possible teaching position. They said the window of opportunity is rapidly closing.

"We hope that President Gbagbo will listen intently to the message that he needs to step down," U.S. State Department spokesman P.J. Crowley said. "So far, he hasn't."

President Barack Obama tried to call Gbagbo three times last month, including twice from Air Force One. He did not reach Gbagbo and at one point, Obama was told that Gbagbo was "resting." Administration officials believe the Ivorian leader sought to avoid contact. So Obama wrote Gbagbo a letter, offering him an international role if he steps down.

Obama also made clear, that the longer Gbagbo holds on and the more complicit he becomes in violence across the country, the more limited his options become, said a senior administration official who requested anonymity to speak about administration strategy.

Gbagbo came to power in 2000 and ruled during the civil war that erupted two years later, then overstayed his legal term which expired in 2005, claiming the country was too unstable to organize a poll. The election was rescheduled at least six times before it was finally held in October.

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Associated Press writers Bashir Adigun in Abuja, Nigeria; Tom Maliti in Nairobi, Kenya; Julie Pace in Honolulu, Hawaii; and Matthew Lee in Washington contributed to this report.