Qatar's prime minister and Turkey's foreign minister arrived in Lebanon on Tuesday in a coordinated visit to discuss the deepening political crisis in the country.
Ahmet Davutoglu and Qatar's Hamad bin Jassim bin Jaber Al Thani, a member of the gulf emirate's royal family, met Lebanon's caretaker prime minister Saad Hariri and president Michel Suleiman.
Davutoglu's trip to Beirut came a day after he held consultations with Iran's new acting Foreign Minister Ali Akbar Salehi in Ankara.
Lebanon's political crisis came to a head last week when the Shiite militant Hezbollah movement toppled the Western-backed government in a dispute over the UN tribunal investigating the assassination of former prime minister Rafik Hariri.
Saad Hariri - the son of the slain leader - refused Hezbollah's demands to renounce the court, prompting 11 Hezbollah ministers and their allies to resign last Wednesday.
The move brought down the unity government and further polarised the country's rival factions: Hezbollah with its patrons in Syria and Iran on one side and Hariri's Western-backed bloc on the other, with support by the US and Saudi Arabia.
Many fear the crisis could lead to street protests and the kind of violence that has bedevilled the tiny Arab country of four (M) million people for years, including a devastating 1975-1990 civil war and sectarian battles between Sunnis and Shiites in 2008.
The UN tribunal late on Monday filed a long-awaited indictment in the Hariri killing.
The indictment was sealed and its contents will likely not become public for weeks.
But the court is widely expected to accuse members of Hezbollah of being involved in the murder, something the Shiite militant group has insisted it will not accept.
Hezbollah fiercely denies any role in the assassination and says the tribunal, jointly funded by UN member states and Lebanon, is a conspiracy by Israel and the United States.