Five social activists have gone missing in Pakistan in the past two weeks, prompting concerns from international rights groups. Samar Abbas is the latest of these social-rights fighters to go missing in the Pakistani capital of Islamabad. His absence was reported by Talib Raza, another activist that works with Abbas at the Civil Progressive Alliance of Pakistan (CPAP), a group that fights against extremism. Abbas’s brother corroborated the complaint to the press when they questioned him about his brother’s whereabouts.

“The family waited for a few days to inform people. When the stories about other activists disappearing started emerging, it became clear what was going on,” Raza told Reuters.

Although there is not currently any evidence of wrongdoing, a number of civil rights groups have accused the Pakistani government of being involved in the recent rash of disappearances.

“Now, with the disappearance of Salman Haider and at least three other activists, a dark new chapter in the state’s murky, illegal war against civil society appears to have been opened,” an editorial in the English-language newspaper out of Pakistan, The Dawn, posited earlier this week.

“By intimidating and picking up social-media activists like this, they have taken away our microphones,” Jibran Nasir told Reuters. Nasir, a human rights lawyer, recently filed an application with Pakistan’s supreme court requesting judicial intervention into the issue. The court has yet to respond to his request.

Hundreds of protestors have taken to the streets in Pakistan, demanding that the local government work to locate the missing activists, and the government has claimed to already be hard on the case, even before Abbas was added to the list.

“This is state bullying. The people who have done this have broken the law,” Senator Afrasiab Khatak, a former head of the independent Human Rights Commission of Pakistan, told protesters who gathered in Islamabad. “This country does not belong to any general, or any bureaucrat, or a capitalist or a feudal lord, it belongs to its people. We will not remain silent.”

Among those who have gone missing in recent weeks are Salmad Haider, a poet and university professor, who was last seen in Islamabad on Friday. Three bloggers, Waqas Goraya, his cousin Asim Saeed, and Ahmed Raza Naseer, have also disappeared. Each of these men has established ties to, or are considered a part of, a pro-democracy movement in Pakistan.