U.S. Secretary of State Hillary Clinton on Wednesday said she rejects any efforts to destabilize Lebanon after Iranian President Mahmoud Ahmadinejad arrived in Beirut for a controversial visit.

"The United States supports the integrity and sovereignty of Lebanon. We reject any efforts to destabilize or inflame tensions within Lebanon," Clinton said in Kosovo where she was meeting political leaders on her two-day tour of the Balkans.

The March 14 forces issued an open letter to Iranian President Mahmoud Ahmadinejad on the occasion of his visit to Lebanon in which it hoped that the visit would "support our sovereign and independent country as well as our way of life, just as your predecessor's visit, President Mohammad Khatami, did and touched all the Lebanese hearts."

It stressed: "A group of Lebanese takes its strength from you and abuses it against the others, as well as against the state in an attempt to restore absurd and unfortunate adventures executed by different non-Lebanese parties successively for decades. This is half of the bitter truth. Its other half is that you are attempting to interfere, just like others that came before you, in our affairs, where foreign interference was only used to manipulate Lebanon internally; the big slogans and the good intentions could not block the actual truth of this use.

Iranian President Mahmoud Ahmadinejad arrived in Beirut Wednesday to a warm welcome and Lebanese President Michel Suleiman acknowledged that Iran has the right to peaceful nuclear energy use.

Huge crowds gathered in the streets of Beirut to welcome Ahmadinejad as he arrived Wednesday morning on a controversial visit that will take him to the doorstep of arch-foe Israel.

A bomb exploded at dawn Wednesday under the car of a pro-Hizbullah Sunni cleric in the northern city of Tripoli, just hours ahead of Iranian President Mahmoud Ahmadinejad's visit, security sources said. No casualties were reported.

They said the explosion targeted the car of Sheikh Mustafa Malas, Imam Minyeh Mosque.

Iranian President Mahmoud Ahmadinejad arrived in Beirut Wednesday to a warm welcome.

Huge crowds gathered in the streets of Beirut to welcome Ahmadinejad as he arrived on a controversial visit that will take him to the doorstep of arch-foe Israel.

Lebanese politicians and members of civil society issued an open letter to Iran's president on Tuesday, accusing him on the eve of his official visit to Lebanon of meddling in the country's affairs.

The letter was signed by some 250 people, among them former MPs close to the Western-backed parliamentary majority, doctors, teachers and journalists. It lashed out at Mahmoud Ahmadinejad over Iran's support of Lebanon's Shiite armed group Hizbullah.

Prime Minister Saad Hariri sponsored and attended Tuesday at the Grand Serail the signing ceremony of the reconciliation and return agreement for the towns of Abay, Bennieh and Ain Drafil in the district of Aley.

The ceremony was attended by Minister of the Displaced Akram Shehayeb, MPs Chant Gengenian, Fadi al-Habr, Dori Chamoun, Henri Helou, Fouad al-Saad and Alain Aoun, President of the Central Fund of the Displaced Fadi Aramouni and the Director General of the Ministry of the Displaced Ahmed Mahmoud, Marwan Abu Fadel representing MP Talal Arslan and members of return committees in the three towns.

Lebanese Forces leader Samir Geagea on Tuesday said Hizbullah weapons are "the biggest cause for strife."

"They say that the issue of false witnesses will cause strife in Lebanon. No. You are a cause for unrest. Hizbullah weapons, to us, are the biggest cause for strife," Geagea said at a press conference from Maarab.

Lebanese Army Commander Gen. Jean Qahwaji warned of the risks of security manipulation and said he was careful when going into issues like the International Tribunal and the indictment and from the problems that could come with them, Al-Akhbar newspaper said Tuesday.

It said Qahwaji has sent messages to the various Lebanese political leaders warning them of the "risks of security manipulation."

Lebanese Democratic Party leader MP Talal Arslan on Monday noted that "the most worrying thing today is what's being written by the Israeli press about Prime Minister Saad Hariri, especially has been published by the Yediot Ahronot newspaper, which clearly shows how angry are the Israelis over his (Hariri's) policy of openness toward Syria and cooperation with Hizbullah – a policy that completely contradicts with Israel's objectives in Lebanon."

Israeli Army "Chief of Staff Gabi Ashkenazi has promised us of a new round of destruction that will blow up cascades of tears and blood," Arslan warned.