Human rights organizations in Venezuela on Wednesday demanded the release of a prominent attorney and activist whose detention last week has heightened concerns over the government’s use of repression against real and perceived adversaries.

The representatives of several rights groups expressed concern over Rocío San Miguel’s well-being and condemned her inability to access legal representation of her choice.

“The prolonged isolation and lack of communication to which the defender Rocío San Miguel and her family have been subjected represent forms of cruel and inhuman treatment, harmful to the psychological and moral freedom of the person,” Claudia Carrillo, coordinator of victims’ psychological care at the Venezuela-based organization Cofavic, said during a press conference in Caracas, the capital.

“We urge her immediate release & respect for her right to legal defense,” the U.N. tweeted Tuesday.