Iraqi security forces cleared anti-government protesters from streets and squares in Baghdad and the south on Saturday, AFP journalists reported, stoking protester fears their long-running campaign risks being sidelined.
It came a day after populist politician Moqtada Sadr organised his own mass rally demanding US troops leave Iraq before announcing that he would no longer back the separate youth-dominated protest movement demanding sweeping reform.
Within hours, security forces had stormed a protest camp in the southern port city of Basra, forcibly dispersing activists, an AFP correspondent reported.
Their tents were burned down and municipal staff could be seen clearing the charred remains to reopen the square.
Many demonstrators were seen taking down tents in the cities of Hilla, Diwaniyah, Kut and Amarah.
In the capital, security forces cleared sit-ins from Tayaran Square, Mohammad Qasim highway and Ahrar Bridge, according to Baghdad military command.
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A medical source told AFP six protesters had been wounded.
Demonstrators had blocked off Tayaran Square and the Mohammad Qasim highway in east Baghdad since Monday in an attempt to pressure the government to enact long-awaited reforms.
Ahrar Bridge, which links east Baghdad to western districts that are home to government buildings and embassies, had been partly occupied by protestors in recent months.
Protesters in Baghdad's Tahrir (Liberation) Square, the main rallying point for the protesters, told AFP they heard live rounds and saw smoke bombs on Saturday as police sought to pin them back.
The security forces did not storm the square and a police source told AFP there was no plan to do so yet.
The protesters had long feared that if Sadr withdrew his support, they would lose political cover.
Sadr, a militiaman-turned-cleric, is notorious for switching political positions with dizzying speed.
He backed the protests from soon after they erupted in October and called on the government to resign -- even though he controls parliament's largest bloc and top ministerial posts.
On Friday, thousands of his supporters gathered in Baghdad after he called for a rally to demand the departure of the 5,200 US troops in Iraq, after a US drone strike in Baghdad killed top Iraqi and Iranian commanders this month.
Sadr himself did not attend, but tweeted late Friday to hail the turnout and say he would no longer be involved in the protesters' campaign for reform.