Cairo police are now searching for two men on a motorbike who opened fire on guests at a church wedding, killing four including an eight-year-old.
A gun fight erupted in central Tripoli, killing four, as a group of former rebels from Libya's third biggest city, Misrata, clashed with ex-fighters.
Millions of Arabs dream of attaining democracy in 2012, aiming to build on gains from the deadly protests that ousted two dictators.
Libya's new rulers have said that they are ready to forgive the forces of slain dictator Muammar Gaddafi.
Officials say Muammar Gaddafi's son Saif al-Islam is just a "helpless criminal" in the Libyan town of Zintan where he can stay until his trial.
Streams of civilians have fled Sirte in Libya while the Red Cross warns of a medical emergency and battles continue.
Two children have been killed in rocket fire as their family joined the quickening exodus of civilians during a two-day window to flee Sirte, Libya.
Heavily armed anti-Gaddafi fighters tightened their siege of the ousted Libyan leader's hometown of Sirte on Monday.
Libya's new rulers have unearthed a mass grave of 1 700 prisoners slain by Muammar Gaddafi's regime in a 1996 uprising.
Hundreds of fighters for Libya's new rulers thrust into Muammar Gaddafi's hometown of Sirte from the east on Sunday, as Nato pounded the coastal city.