3. Wide interior of Lebanese parliament in session
4. Various of Lebanese members of parliament (MPs)
5. SOUNDBITE (Arabic) Marwan Hamadeh, Lebanese Member of Parliament: ++includes various cutaways of parliament++
"No, Mr. Prime Minister Mikati, your friend Hariri wasn't just martyred. He was assassinated with two tons of explosives, along with him, your colleagues, your friends and your citizens. For them, you have a holy responsibility that will follow you, will chase you, forever and ever. The worst series of the worst crimes in the history of Lebanon is being treated with irreverence, without investigation, without question and without punishment, and now after 30 years it is on the precipice of being solved, and its executors, God willing, and those who ordered it, will be known."
Lebanon's parliament began three days of contentious debate on Tuesday, over the government's response to UN-backed indictments which accuse four Hezbollah members of involvement in the 2005 murder of former prime minister Rafik Hariri.
In parliament on Tuesday, MP Marwan Hamadeh told Lebanon's new Prime Minister, Najib Mikati, that he had "a holy responsibility that will follow you, will chase you, forever and ever" to bring Hariri's killers to justice.
Hamadeh himself was injured in a car bomb explosion on October 1, 2004 that killed his driver and injured his bodyguard.
The blast is considered to have been the beginning of a series of assassinations of Lebanese politicians and journalists, one of which claimed the life of Rafik Hariri.
Tuesday's session in Beirut pitted Lebanon's rival factions against each other. Hezbollah and its allies are on one side, and a Western-backed coalition led by Hariri's son, Saad, is on the other.
On Monday, Saad Hariri accused Mikati of bowing to pressure from Hezbollah, which is refusing to turn over four members indicted by the UN-backed tribunal for the truck bombing that killed the Lebanese statesman in 2005.
Mikati fired back, suggesting Saad Hariri - himself a former prime minister - was trying to exploit his father's death for political gain and tear apart the country.
The implication of the Iranian-backed militant group Hezbollah in one of Lebanon's most stunning crimes threatens to bring a new and violent crisis in this Arab nation on Israel's northern border.
The Shiite militant group denies any role in the killing and vows never to turn over any of its members.