the 1975-90 civil war.
Judge Jean Fahd also ordered the arrest of six civilians for rioting and bearing unlicensed arms.
Shi'ite Muslim Hezbollah, a powerful group backed by Syria and Iran, had said the army mishandled Sunday's incident which occurred after troops opened fire to break up a protest in south Beirut over power cuts, and demanded a swift inquiry.
Seven supporters of Hezbollah and a Shi'ite ally were killed and some 30 protesters were wounded in the violence, the worst since pro-government supporters and opposition followers clashed in Beirut a year ago.
The bloodshed and Hezbollah's ensuing harsh criticism of the army, traditionally a close ally in its conflict with Israel, raised tension in a country going through a deep political crisis which has left it without a president since November.
Sunday's violence also fuelled fears of factional bloodshed unless a 14-month-old conflict between the Hezbollah-led opposition and the Western-backed ruling coalition is resolved.
In the first reaction to the investigation so far, a senior opposition source told Reuters:
"The initial results of the investigation show a high level of seriousness in (dealing with the matter) that assures us that things are going in the right direction."
Authorities had listened to 85 civilian witness statements and questioned 120 military personnel. They also made use of closed circuit television footage and media video footage of the violence.
Weapons confiscated in the area were examined to determine whether or not they had been used, a judicial statement said.
26 civilians who were arrested earlier were released on bonds including five minors
"The investigation is still continuing with a large number of civilian witnesses and a number of soldiers," it said.
Army commander General Michel Suleiman, also a presidential nominee, had been under pressure to identify those behind the violence. The anti-Syrian majority had accused the opposition of sparking the protest for political ends.
The army has a reputation of being the only institution capable of keeping the peace in Lebanon in the three years since the slaying of former Prime Minister Rafik al-Hariri.
While the Damascus-backed opposition and Western-backed governing coalition have agreed on Suleiman as president, differences over the shape of a future government have held up his confirmation as head of state. The Hezbollah-led opposition is insisting on a government that gives them the right to veto its decisions.
The pro-government leaders have accused the Hezbollah -led opposition of engineering the Sunday riots because they did not succeed in their protests to form a government in which they will have a veto power .
"Sunday riots confirm the threats made by Hezbollah -led opposition in the event they did not succeed in forcing the formation of a government of national unity in which they will have a veto power, Information Minister Ghazi Aridi said.
Some analysts say the army's handling of the incident, which took place in the same area where the civil war started, puts its credibility at stake and may hurt Suleiman's chances of becoming president.
Picture: An armoured Lebanese army personnel carrier patrols the Mar Makhaeil area during clashes with the Hezbollah-led opposition protesters in Beirut's suburbs January 27, 2008
Sources: Ya Libnan, Reuters
Tags: Army, Hezbollah, Iran, Lebanon, riots, Suleiman, Syria
