Tripoli, Libya (CNN) -- The United Nations secretary-general and the president of the U.N. General Assembly arrived in Tripoli Wednesday, for a meeting with the country's new leaders, a U.N. statement said.
Ban Ki-moon and Nassir Abdulaziz Al-Nasser of Qatar, the General Assembly president, will meet with members of Libya's National Transitional Council and others, the statement said. The two will also meet with reporters.
Ban will travel to Cannes, France, Wednesday night, according to the U.N. More details on Ban and Al-Nasser's visit will be provided later Wednesday, the statement said.
While the Libyan war is officially over, rivalries and mutual distrust among some regional militias pose a challenge to the nation's new leadership.
On Monday, dozens of fighters clashed at a Tripoli hospital in what residents described as the biggest armed confrontation in weeks. Two Zintani rebels died as a result of that firefight, Housam Nhajar, commander with the Tripoli brigades, said Wednesday.
Tripoli fighters said Tuesday they are concerned about rising tensions among the various groups, which are divided along regional alliances. Meanwhile, the current scene on Tripoli's streets -- heavily armed men brandishing guns and racing across the city with no central command and little or no accountability -- has residents concerned.
Disarming tens of thousands of fighters who brought down ruler Moammar Gadhafi and bringing them under control is a top challenge for the fledgling interim government. Acting Prime Minister Abdurrahim El-Keib is expected to present his Cabinet within two weeks.
Military officials downplayed the tensions among the various militias, and they have said their biggest challenge is rebuilding the military.
Gadhafi was captured and killed last month.
CNN's Jomana Karadsheh contributed to this report from Tripoli