The United Nations Secretary General on Friday called for the full implementation of a United Nations Security Council resolution that ended last summer's war between Lebanon and Israel.
Ban Ki-Moon also urged rival Lebanese leaders to engage in dialogue as the only way to end a deepening political crisis and approve an international court to try suspects in the 2005 assassination of former Premier Rafik Hariri.
He met separately with Parliament Speaker Nabih Berri, who hails from opposition ranks aligned with Hezbollah and with Prime Minister Fuad Saniora, who is backed by the parliamentary majority.
"I also discussed with the speaker as I mentioned, the issue of a special tribunal and emphasised my commitment to the establishment of that tribunal for Lebanon as soon as possible," said Ban at a briefing after his meeting with Berri.
He was also to meet later on Friday with U.N. peacekeeping officials and Lebanese military and police commanders.
Ban met with Rafik Hariri's son, Saad, who heads the pro-government parliamentary majority in Lebanon.
They discussed the establishment of the tribunal that may try the suspects involved in the assassination of his father.
"Committing crimes in this manner without the punishment of the murderers is like licensing them to kill, so the United Nations is following up the establishment of the tribunal," said Saad Hariri after his meeting with Ban.
Ban also met with senior Druse leader, Walid Jumblatt.
On Saturday, Ban is to travel to the south Lebanon border area to visit with U.N. troops stationed in the south, near the border with Israel.
Ban has criticised both Israel and Lebanon for violating Resolution 1701, noting an increase of Israeli military overflights of its northern neighbour in February and early March.
The resolution also calls for a halt in arms shipments to Hezbollah, and demands the "unconditional release" of two Israeli soldiers Hezbollah captured in a cross-border raid.
The incident triggered last summer's 34-day war that ended with a 14 August ceasefire.
Hezbollah has refused to release the soldiers without negotiations to trade them for Arabs held by Israel.
The resolution also provided for the deployment of a reinforced U.N. peacekeeping force, now numbering close to 13-thousand.
Ban arrived Thursday in Beirut from Riyadh, Saudi Arabia, where he attended a summit of Arab leaders.
His tour of the Middle East has already taken him to Iraq, Jordan, Egypt, Israel and the Palestinian territories.