Fresh from fighting Israeli troops in south Lebanon this summer, militant Hizbullah is engaged in a new battle – this one political. Its supporters and its opposition allies are camping on the streets of Beirut determined to bring down the Western-backed Lebanese government.

Hizbullah's new campaign, which entered its third day Sunday, brings into sharp relief the conflicting motivations underpinning the group, in which its ambitions as a national party are balanced against obligations as an Iranian and Syrian ally in the struggle to curb US regional influence.

But to win politically at home, especially in its bid to bring down the anti-Syrian March 14 ruling coalition, Hizbullah has to convince Lebanon that it isn't simply pushing an agenda dictated by Tehran and Damascus.

"The Syrian-Iranian camp, led by Hizbullah, has begun to implement a plot for a coup," proclaimed a headline in Saturday's Al-Mustaqbal newspaper, which is owned by the family of Saad Hariri, who heads the March 14 bloc.

To be sure, Hizbullah denies that its actions are dictated by outsiders. "Definitely Michel Aoun is not allied to Syria and Iran, and he's a big component of this opposition movement," says Ali Mokdad, a Hizbullah member of parliament, referring to a retired general who heads a mainly Christian opposition party and fought the Syrian Army in Lebanon in 1989-90. "This accusation is not logical. We are a completely Lebanese movement."

Rows of coiled razor wire and armored vehicles mark the new front line in Lebanon's latest political crisis. The barricades are strung across roads leading to the Grand Serail, the Ottoman-era military barracks that today houses the offices of the prime minister, Fouad Siniora. Mr. Siniora and several cabinet colleagues have been working and sleeping in the safety of the Grand Serail since the assassination two weeks ago of Pierre Gemayel, industry minister and a Christian leader.

A stone's throw from the hilltop building are dozens of white canvas tents erected by the protesters Friday evening. One city square facing theGrand Serailand the glass and stone United Nations building is occupied by supporters of Hizbullah and its allies in the Amal Movement, another by Christian and Druze opposition groups.

A towering bank of loudspeakers broadcasts a steady diet of Hizbullah military songs and recorded speeches by Sheikh Hassan Nasrallah, Hizbullah's charismatic leader.

"We will be here not less than five days," says Ali Allawi, a Hizbullah supporter from Tyre in south Lebanon. "It might take longer because those people up there are crocodiles," he adds with a dismissive gesture at the nearby Grand Serail.

The long-simmering political crisis escalated two weeks ago when a depleted government endorsed a UN resolution to form an international tribunal to try those suspected of killing Rafik Hariri, a former prime minister who died in a truck bomb explosion in February last year. The vote went ahead without the participation of six ministers – including all five Shiites – who quit the government prior to the emergency cabinet session.

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