CNN) -- A leading Iranian human rights activist and journalist was arrested Wednesday, activists said.

Kaveh Ghasemi Kermanshahi was taken by seven security agents who searched his home and took personal belongings including his computer, the International Campaign for Human Rights in Iran said in a statement.

It is not clear where he is being held.

"Kermanshahi is one of the most important sources of objective human rights information and analysis in Iran, and one of the few still courageously working to document, in a scientific way, the deprivation of human rights there," said ICHRI representative Hadi Ghaemi from New York.

 Chemical Ali executed for Halabja massacre

James Hider, Middle East Correspondent

January 26, 2010  

Ali Hassan al-Majid, the Iraqi general better known as "Chemical Ali" for his genocidal gas campaign against the Kurds, was hanged yesterday in Baghdad. He was the highest-ranking member of the regime to be executed since his cousin Saddam Hussein was sent to the gallows in 2006.

Against the backdrop of yet more deadly bombings in Baghdad, al-Majid was "executed by hanging until death", Ali al-Dabbagh, a spokesman for the Government, said. One of the most feared leaders of a brutal regime, al-Majid oversaw the Anfal campaign in the 1980s to crush Kurdish opposition in the north of Iraq, culminating in the nerve gas attack on the village of Halabja in 1988.

 Hassan Ibrahim Saleh is a member of the political committee of the Kurdish Yekiti Party in Syria. He was born in 1947, and is married with eight children. He is a retired teacher with a degree in geography. He is a resident of the town of Qamishli – Hasakah province.

 Mohamed Mustapha is a member of the Political Committee of the Kurdish Yekiti Party in Syria. He was born in 1962, and is married with one daughter. He is a lawyer and a former detainee. He is a resident of the town of Qamishli – Hasakah province.

 Maroof Mulla Ahmed is a member of the Political Committee of Kurdish Yekiti Party in Syria. He was born in 1952, and is married with four children. He has a high school diploma, and is also a former detainee. He is a resident of the town of Qamishli – Hasakah province.

 Anwar Nasso is a political activist. He was born in 1962, and is married with three children. He is an artist, and holds a qualification in agricultural studies from college, and he is employed. He is also a former detainee, and is a resident of Amuda town in Hasakah province.