The authorities in China have detained the pastor of one of the country’s most prominent underground churches, along with dozens of other people affiliated with his church, according to the pastor’s family and members of the church, prompting worries about a renewed crackdown on religion.

The pastor, Jin Mingri, who also goes by the name Ezra, founded Beijing Zion Church in 2007. It grew into one of the country’s largest unofficial congregations, with several satellite campuses and over 1,000 people attending its weekend services.

Mr. Jin, 56, was detained on Friday at his home in the city of Beihai in Guangxi Province, according to his daughter, Grace Jin, who lives in the United States. Around the same time, nearly 30 other Zion Church pastors or workers were taken into custody or went missing around the country, including in Beijing, Shanghai, Shenzhen and other cities, she said.

Calls to the Beihai police rang unanswered on Sunday.

Ms. Jin said her family had not been able to reach her father but that they had heard from other church members, some of whom were released after their initial detentions, that he was being accused of illegal dissemination of religious information.

The Chinese Constitution guarantees freedom of religion, but in practice, the Chinese Communist Party permits only tightly controlled, state-approved congregations to operate openly. Still, it is estimated that tens of millions of Chinese Christians worship in underground churches, also called house churches.