Arab League foreign ministers agreed at an emergency meeting in Cairo to send a mission to Beirut to help mediate an end to the Lebanese crisis, led by the Qatari prime minister.
"We want to rescue Lebanon," Arab League chief Amr Moussa told a news conference. He said the ministers condemned the use of violence to achieve political goals.
Lebanon's political stalemate turned violent on Wednesday after the government decided to try to move against a military communications network operated by Hezbollah, and sacked the head of security at Beirut airport, who is close to the group.
Hezbollah called the move a declaration of war, saying the network had played a key role in its war with Israel in 2006.
Hezbollah seized much of west Beirut on Friday, then pulled back to let the army take control of areas they had captured after the army overturned the government's decisions.
However, Hezbollah said it would maintain a campaign of civil disobedience until all its demands were met.
In particular, it wants explicit recognition that it can keep its weapons for use against Israel. It also demands veto power in any new government, and a new electoral law, before allowing the election to the presidency of army chief General Michel Suleiman, who both sides agree should fill the post.
CABINET TO MEET SOON
Prime Minister Fouad Siniora said his cabinet would meet soon to decide on Hezbollah's demands, and on the army's request that the government annul this month's decisions altogether.
Hundreds of soldiers backed by armoured vehicles set up roadblocks in Beirut and took up positions on the streets of the mainly Muslim part of the capital.
There were no gunmen in sight but youths maintained barricades on some crucial roads, ensuring Beirut's air and sea ports remained closed.
The United States, which considers Hezbollah a terrorist group, a threat to Israel and a weapon in the hands of its arch-foe Iran, had welcomed the end of the Beirut fighting.
Iran blamed the United States and Israel for the escalation in Lebanon and said it backed an internal solution to the political deadlock.
The governing coalition accuses Hezbollah of seeking to restore the influence of neighbouring Syria, which was forced to withdraw its troops from Lebanon in 2005.
