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Supporters of powerful Shia cleric penetrated heavily fortified Green Zone on Saturday, occupying parliament with no immediate plan to leave.

In a deepening political crisis, it is the second time this week that Sadr supporters have forced their way in to the legislative chamber, months after elections that failed to lead to formation of a government.

"The demonstrators announce a sit-in until further notice," Sadr's movement said in a brief statement to journalists over the WhatsApp messaging platform and carried by state news agency INA.

Supporters of Sadr, who once led a militia against US and Iraqi government forces, oppose the recently announced candidacy of Mohammed Al-Sudani, a pro-Iran bloc's pick for prime minister.

Demonstrators waved Iraqi flags and pictures of the cleric inside the legislature.

They crowded the chamber where some sat at lawmakers' desks while others milled about, raising their mobile phones to film the occupation.

They entered after thousands of protesters had massed at the end of a bridge leading to the Green Zone before dozens pulled down concrete barriers protecting it and ran inside, an AFP photographer reported.

Security forces had fired tear gas near an entrance to the district, home to foreign embassies and other government buildings as well as parliament.

Some protesters on the bridge were injured and carried off by their fellow demonstrators.

"All the people are with you Sayyed Muqtada," the protesters chanted, using his title as a descendant of the Prophet Mohammed.

Sadr's bloc emerged from elections in October as the biggest parliamentary faction, but was still far short of a majority.

Ten months on, deadlock persists over the establishment of a new government.

The mercurial Sadr, long a player in the country's politics, has a devoted following of millions among the country's majority Shia Muslim population.

His supporters oppose the candidacy of former minister and ex-provincial governor Sudani, who is the pro-Iran Coordination Framework's pick for premier.

The protests are the latest challenge for oil-rich Iraq, which remains mired in a political and socioeconomic crisis despite elevated global crude prices.

Saturday's demonstration came after crowds of Sadr supporters breached the Green Zone on Wednesday despite volleys of tear gas fire from the police.

They left two hours later but only after Sadr told them to.

'Revolution'

On Saturday, security forces shut off roads in the capital leading to the Green Zone with massive blocks of concrete.

"We are here for a revolution," said one protester, Haydar Al-Lami.

"We don't want the corrupt; we don't want those who have been in power to return… Since 2003, they have brought us only harm," he said, referring to the year when a US-led invasion toppled dictator Saddam Hussein.

By convention, the post of prime minister goes to a leader from Iraq's Shia majority.

Last month, Muqtada al-Sadr ordered his supporters in Iraq's parliament to resign.

Did this unexpected move simply hand power over to his rivals? Or was this a tactful political manoeuvre?

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Sadr had initially supported the idea of a majority government.

That would have sent his Shia adversaries from the Coordination Framework into opposition.

°Õ³ó±ðÌý draws lawmakers from former prime minister Nouri Al-Maliki's party and the pro-Iran Fatah Alliance, the political arm of the Shia-led former paramilitary group Al-Hashd Al-Shaabi.

But on 12 June Sadr's 73 lawmakers quit in a move seen as seeking to pressure his rivals to fast-track the formation of a government.

Sixty-four new lawmakers were sworn in later that month, making the pro-Iran bloc the largest in parliament.

That triggered the fury of Sadr's supporters, who according to a security source also ransacked the Baghdad office of Maliki's Dawa party on Friday night, as well as that of the Hima movement of Ammar Al-Hakim, which is a part of the Coordination Framework.

"We would have liked them to wait until the government was formed to evaluate its performance, to give it a chance and to challenge it if it is not," Hakim said in a recent interview with BBC Arabic.

"The Sadrist movement has a problem with the idea that the Coordination Framework will form a government," he said.