Arab diplomats are due to meet with Lebanese leaders in Beirut Monday to discuss an Arab League proposal to resolve the political crisis in the country.
Sudanese presidential adviser Mustafa Ismail will meet government and opposition leaders after talks with Syrian officials in Damascus. Arab League Secretary-General Amr Moussa will join him in Beirut Tuesday.
Both men held separate talks in Beirut last week.
Hundreds of thousands of Hezbollah protesters and allies of the Shi'ite militant group attended a rally in central Beirut Sunday.
The demonstrators were pressing demands for a national unity government that grants more power to Hezbollah and its allies.
Ismail told Arabiya television that all parties in Lebanon had agreed to Arab League mediation.
The mediation proposal is reported to include a unity government, early national elections and passage of a U.N.-proposed international tribunal to try suspects in last year's assassination of former Prime Minister Rafik al-Hariri.
Some information for this report was provided by AP and Reuters.