Shujaa al-Khafaji's family said armed men had snatched him from his home on Thursday without identifying themselves or showing an arrest warrant.

Khafaji's Facebook page, Al-Khowa al-Nadifa (Arabic for "Those Who Have Clean Hands"), carries posts on political and social issues and has some 2.5 million followers.

"Around 15 men wearing masks and black uniforms" took Khafaji from his home, the blogger's father, Fares al-Khafaji, told AFP.

He said they seized his son's phones and computers, but were not violent.

Twenty-four hours later, Khafaji was "abandoned in a street with $20 to pay for a taxi home", his father added.

The report of Khafaji's seizure sparked an outcry from activists and influential political leaders.

Rights watchdog Amnesty International denounced a "relentless campaign of intimidation and assault against activists in Iraq" by authorities.

"The Iraqi authorities must immediately rein in the security forces and dismantle the climate of fear they have deliberately created to stop Iraqis from peacefully exercising their rights to freedoms of expression and assembly," said Lynn Maalouf, the group's Middle East research director.

The group said other activists, including a doctor and a lawyer, were "forcibly disappeared more than 10 days ago", and called on Iraqi authorities to reveal their whereabouts.

Firebrand Shiite cleric Moqtada Sadr wrote on Twitter that "any act of aggression (against journalists or activists)... by the state constitutes an attack on freedom of speech".

Former prime minister Haider al-Abadi's parliamentary bloc called on the government "to stop abuses of free media".

Iraq was gripped by anti-government protests between October 1 and 6, during which 110 people, mainly demonstrators, were killed in clashes with security forces.

During the protests, unidentified armed men in uniforms raided several local television stations in Baghdad, destroying their equipment and intimidating their staff.

Journalists and activists also reported receiving threats, mostly by phone, from unidentified callers accusing them of having sided with the protesters.

Khafaji faced online harassment last month after a string of attacks on bases of the Hashed al-Shaabi, a paramilitary force dominated by pro-Iran groups.

The group on Thursday denied any involvement in the disappearance of activists, threatening legal action against anyone making such accusations.

But according to Amnesty, the Hashed was involved in at least one abduction -- that of lawyer Ali Hattab, who represented protesters and was seized on October 8 in the southern city of Amara.

He was snatched by "suspected members of a faction of the Popular Mobilisation Units (Hashed)", Amnesty said quoting Hattab's relatives.

It happened two days after "two armed men from the PMU came to (his) home to warn him to stop being vocal about the killing of protesters on Facebook, otherwise they would kill him", Amnesty added.

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