Lebanon prepared to bury the victims of its deadliest sectarian unrest in years Friday after gunfire gripped central Beirut for hours and revived the ghosts of the civil war. Six people were killed and dozens wounded Thursday when violence erupted following a rally by pro-Hezbollah protesters demanding the removal of the judge investigating last years port blast. The Amal movement and Hezbollah that organized the protest in front the Justice Palace accused the Lebanese Forces (LF) Christian party of engineering the chaos by aiming sniper fire at the demonstrators. The LF strenuously denied any involvement in Thursdays flare-up and said Hezbollah was "invading" off-limits neighborhoods when the violence broke out. A heavy army presence was visible on the streets Friday amid fears of an escalation. On Thursday, Amal and Hezbollah militiamen in their hundreds filled the streets around Tayouneh, a notorious civil war flashpoint near the spot where the April 1975 attack often presented as the trigger of the conflict occurred. As a deluge of bullets riddled residential facades, and gaggles of fighters wearing ammunition vests took over the streets and emptied their magazines haphazardly, civilians crouched in homes, terrified. When Maryam Daher, a 44-year-old mother of two, saw civilians running for safety on television, she broke down. "It all came back to me," she said. "At the very same moment, I received a message from my sons school asking parents to come and collect the children." One of the six people killed was a mother of five hit in the head by a stray bullet inside her home. France, the United States and United Nations appealed for calm but also insisted on the need to allow the port explosion probe to continue unhindered.