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Hundreds of sympathisers and members of the writer's tribe protested on Monday outside the premier's office.

Carrying the writer's portrait, they called for the resignation of both Prime Minister Hani al-Malki and Interior Minister Salama Hammad.

"The people want the fall of the government... No security, they killed Nahed in Amman," they chanted.

Hattar's family has also refused to collect his body for burial, charging that authorities were warned of threats to Hattar's life and had failed to act.

"We handed over 200 names [of people who had threatened the writer] to the governor [of Amman], including that of the assassin, and demanded protection," said Khaled Hattar, one of the victim's brothers.

"But he refused, saying there was 'no real threat'."

A bearded assailant on Sunday shot Hattar dead, 56, on the steps of a court in central Amman where he was facing trial for sharing a cartoon deemed "anti-Islam" on social media.

Protesters called on the government to resign [Anadolu]

Jordan's judiciary on Monday slapped a media blackout on the murder.

The information ministry said the aim was to preserve "the secrecy of the investigation" and that the blackout applied to both social and traditional media.

Hattar had faced charges over a cartoon he posted on Facebook under the title "God of Daesh" (the Islamic State militant group) showing a bearded man in bed smoking with two women lying on either side, and addressing God as a servant.

He was hit by three bullets before the alleged assassin was arrested at the scene of the shooting in the capital's Abdali district, official media said.

Amnesty criticises government

The assailant - "bearded and robed like a conservative Muslim", according to witnesses - shot him as he made his way up the steps outside the court.

Amnesty International condemned "this deplorable murder" but also criticised the government.

"By using strict blasphemy laws to prosecute a person for peacefully exercising their right to freedom of expression, Jordanian authorities are fuelling a climate in which violent threats against people whose views are deemed offensive by others are allowed to flourish," said Philip Luther of Amnesty's Middle East and North Africa department.

The UN's cultural agency also condemned the killing.

"This crime constitutes a grave attack on freedom of expression and affects Jordanian society as a whole," said UNESCO director-general Irina Bokova.

The gunman, identified as a 49-year-old Jordanian, gave himself up to police after the killing, a security source said.

A judicial source said the assailant was remanded for 15 days and charged with premeditated murder, facing the death penalty if convicted.