Amnesty International has urged Pakistani authorities to immediately release eight people arrested by the Federal Investigation Agency (FIA) for "criticising the state" on Twitter.

"The Pakistani authorities must stop using the draconian Pakistan Electronic Crimes Act (Peca) to punish people who are simply exercising their right to freedom of expression online," Dinushika Dissanayake, the human rights organisation's director for South Asia, demanded.

She pointed out that for the longest period of time successive governments had used the law as a tool to crush peaceful dissent and intimidate supporters of political opposition.

Dissanayake called for the government to immediately and unconditionally release the eight people arrested across Punjab, adding that instead of quashing dissenting voices, the authorities should end their "repressive crackdown" on the right to freedom of expression.

Earlier this week, the FIA launched a crackdown on social media activists that it believed were involved in a "smear campaign" against institutions, especially the army, since former prime minister Imran Khan was ousted through a no-confidence motion.

Read: IHC orders FIA to stop harassing PTI's activists, workers

Since last Sunday, the top trending hashtags on Twitter were those targeting the army, the judiciary and the new government, and on Tuesday the tweets using those hashtags soared to 4.3 million.

An FIA official told Dawn that they had arrested some eight suspects in connection with a social media campaign against the army and the judiciary from different parts of Punjab, including Lahore, Multan, Faisalabad and Gujrat.

He, however, added that the arrests were not related to any political parties.

Meanwhile, a press conference of Inter-Services Public Relations (ISPR) Director General (DG) Major General Babar Iftikhar yesterday condemned the criticism on the army and called it "malicious propaganda".

The ISPR DG said that everything against the state institutions on social media was being "amplified" through external linkages and fake technology.