A crackdown on demonstrators taking part in nationwide protests in Iran killed at least 4,029 people, activists said Tuesday. The US-based Human Rights Activists News Agency offered the toll, saying more than 26,000 people have been detained in the crackdown as well. It said of the dead, 3,786 were demonstrators, 180 security forces, 28 children and 35 were people not demonstrating.

The agency has been accurate in previous rounds of unrest in Iran and relies on a network of activists on the ground to confirm each death. It fears many more may have been killed. The AP has been unable to independently confirm the toll. Iran`s Foreign Minister Abbas Araghchi had his invitation to speak at the World Economic Forum at Davos, Switzerland, withdrawn over the killings.