"Faisal Yusef, a leader of the Kurdish Progressive Democratic Party in Syria, informed the SOHR that Hussein's whereabouts and the reasons for his detention are unknown," a statement from the rights group said.
"Hussein, a resident of Amuda, writes about general Syrian issues for several newspapers and websites. He is well known for supporting human rights and democracy issues in Syria."
The SOHR urged the Syrian authorities to immediately release Hussein, a father of four.
"He should be released immediately and unconditionally. The security services should stop arbitrary detention," it said.
"The country needs a modern law to organise political parties and ensure Syria's unity and safety."
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"Hussein, a resident of Amuda, writes about general Syrian issues for several newspapers and websites. He is well known for supporting human rights and democracy issues in Syria."
The SOHR urged the Syrian authorities to immediately release Hussein, a father of four.
"He should be released immediately and unconditionally. The security services should stop arbitrary detention," it said.
"The country needs a modern law to organise political parties and ensure Syria's unity and safety."
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