It also ends opposition hopes that President Recep Tayyip Erdogan may ease the crackdown and build greater national consensus after his narrow victory in a recent referendum to expand the power of his office.
Instead, Mr. Erdogan has accelerated the process. Since the referendum, and before Saturday’s move, the police had detained more than 1,000 workers and suspended a further 9,000 accused of having ties to an Islamic group founded by a United States-based cleric, Fethullah Gulen.
The organization was once allied with Mr. Erdogan, but is now accused by the government of masterminding the failed attempt to overthrow him in July. Those purged on Saturday were also accused of having connections to Mr. Gulen.
The crackdown has also affected leftists, liberals and members of the secular opposition across most sections of public life, many of whom have long voiced their opposition to the Gulen movement. Those in jail or out of a job include academics, public transport employees, teachers and at least 120 journalists — more than in any other country in the world.
It was not immediately clear exactly why Wikipedia was targeted, but the ban is the latest salvo against freedom of expression in Turkey. More than 150 news outlets have been shut down by decree since July, according to one estimate.
The government justified the ban by claiming that the site’s articles constituted “a smear campaign against Turkey in the international arena,” according to a statement published by Anadolu Agency, the state-owned news wire.
The ban followed Wikipedia’s refusal to remove content that the Turkish government found offensive, the government said.
Jimmy Wales, Wikipedia’s founder, criticized the decision in a tweet. “Access to information is a fundamental human right,” he wrote. “Turkish people I will…