An economic court in the Tajik capital of Dushanbe justified the decision to close off the headquarters of the Islamic Renaissance Party of Tajikistan (IRPT) for at least 10 days by citing "disagreements between the department of state property in Dushanbe and the owner of the administrative building where the office of IRPT is located."
The owner of the building, Muhammadjon Nuri, son of former party leader Said Abdullo Nuri, has denied there is a conflict over its ownership.
The IRPT became an umbrella opposition bloc for moderate Muslims as well as more secular-minded Tajiks following the 1997 peace deal between the government and the United Tajik Opposition (UTO) that ended a five-year civil war.
The IRPT failed to win a single parliamentary seat for the first time since the end of the civil war in disputed elections earlier this year.
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This left Rakhmon's party without real opposition, leading to a harder line on religion, including a ban on importing hijabs and reports of forcible beard shaving.
The party complained of "illegal and immoral actions by the state organs against individuals, parties, opposition and religious groups", and noted the government's marginalisation of the opposition could increase the appeal of religious radicalism in the country.
There are up to 600 Tajik citizens currently fighting for the Islamic State group in Syria and Iraq, according to Tajikistan's security services.