A Czech cardinal has criticised online censorship after his Twitter account was suspended.

Cardinal Dominik Duka of Prague announced the reactivation of his account, but said that he had received no explanation for its suspension.

The cardinal, who was imprisoned by the communist authorities in 1981-82, compared present-day censorship to that of the 1980s. “Now, however, on the basis of fictitious statements, it is not man who punishes, but artificial intelligence, led by the crowd to suppress ‘wrong’ ideas,” he wrote on Twitter.

Czech media said a possible reason for the suspension was a tweet that Duka posted last month linking to an article about the confirmation of Judge Amy Coney Barrett to the U.S. Supreme Court.

The article had criticised the Czech media’s portrayal of Barrett as a member of a “Catholic sect.”

As a young priest Duka clashed with the communist regime in Czechoslovakia. Arrested for ministering covertly, he was sent to Bory Prison in Plzeň where fellow inmates included future Czech President Václav Havel. While there, Duka celebrated Mass for the prisoners under the guise of a chess club.