'The Lebanese opposition will end all armed presence in Beirut so that the capital will be in the hands of the army,' an opposition statement said.
The statement, however, said the opposition would maintain a 'civil disobedience' campaign until its political demands were met.
Earlier, gunmen killed six people in Beirut during the funeral procession of a Sunni civilian killed on Thursday night.
20 people are reported injured, six of them in critical condition.
Five people were killed earlier in clashes in north Lebanon between supporters of the Western-backed government and of the opposition.
Hezbollah seized control of west Beirut yesterday after three days of deadly battles with pro-government forces, worsening a political crisis that has prevented the election of a president in Lebanon since September 2007.
Syria, which has been accused by the US of fuelling violence in Lebanon, is said to be undecided about attending an emergency Arab meeting on the crisis.
Sheikh Hamad bin Jassem al-Thani told Al-Jazeera television there are 'hesitations' on the part of the Syrian authorities about attending the meeting of Arab foreign ministers in Cairo tomorrow.
The 22-member Arab League is being convened for emergency talks on the Lebanese crisis, at the request of regional heavyweights Saudi Arabia and Egypt.
