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Hundreds of were camped out Sunday inside the Iraqi parliament, after toppling security walls around the building and storming in the previous day.

The protesters — followers of Iraqi Shia cleric Muqtada al-Sadr — pledged to hold an open-ended sit-in to derail efforts by their rivals from to form the country's next government.

: Protesters take over parliament & chant against rival pro- factions - as Muqtada al-Sadr turns up political heat through another show of force

— sebastian usher (@sebusher)

The developments have catapulted Iraq's politics to center stage, plunging the country deeper into a political crisis as a power struggle unfolds between the two major Shia groups.

On Sunday, the sit-in appeared more of a joyous celebration that a political protest — followers of al-Sadr were dancing, praying and chanting slogans inside the parliament, in praise of their leader.

In between, they took naps on mattresses lining the grand halls.

It was a scene starkly different from the one on Saturday, when the protesters used ropes and chains to topple cement walls around the heavily fortified Green Zone in Baghdad, then flooded into the assembly building. It was the second such breach last week, but this time they did not disperse peacefully.

Today when we had covered the storming of green zone by Al-Sadr followers for the second time within week.

— Haider Ahmed (@HaiderAhmedHA)

Iraqi security forces fired tear gas and sun grenades at first, to try to repel the demonstrators. The Ministry of Health said about 125 people were injured in the violence — 100 protesters and 25 members of the security forces. Within a few hours, the police backed off, leaving the parliament to the protesters.

Outside the building, garbage from food packages and other trash littered the street leading up to the parliament gate while trucks bused in giant couldrons of steaming rice and beans to feed the protesters.

There was also humor inside the parliament Sunday among al-Sadr's followers.

One protester, Haidar Jameel assumed the seat of Parliament Speaker Mohammed Halbousi — among the most powerful political figures in Iraq — and from it, looked on at his rowdy fellow protesters in the assembly.

After al-Sadr's followers took over the parliament, Halbousi suspended future sessions until further notice.

"This is an open-ended sit-in, we will not return until our demands are met," he declared.

Boxes of bottled water were piled up on the street and tents were erected. A small child handed out sweets, teenagers sold juice from sacks.

The takeover of the parliament showed al-Sadr was using his large grassroots following as a pressure tactic against his rivals in the Coordination Framework — an alliance of Shiite parties backed by Iran and lead by former Prime Minister Nouri al-Maliki — after his party was not able to form a government despite having won the largest number of seats in the federal elections held last October.

Neither side appears willing to concede and al-Sadr seems intent on derailing government formation efforts by the Iran-backed groups.