The lawyers say the detained pastor, Zhang Shaojie, and other church leaders are being punished for resisting local authorities' attempts to seize the church's land. Officials in Nanle either could not be reached or said they were unaware of the case.
Liu said around 100 thugs surrounded the lawyers Thursday outside the detention center after their fifth and latest attempt to meet Zhang. He said the thugs harassed the attorneys and took many of their cellphones.
Activists say local Chinese authorities often hire men from the area to intimidate and harass people or groups that police and other officials want to drive away.
The lawyers said Zhang and the other church leaders were arrested for "obstructing official business" and gathering a crowd to disrupt public order, a vaguely worded charge that has recently been used in politically motivated cases. Around two dozen other churchgoers have also been rounded up, but have not been officially arrested, Liu said.