Police said they were called to a flat near the Plaza de la Gesta at around daybreak last Saturday after a neighbour called in to report the "blood-curdling" screams of a woman.
"I heard a woman screaming and it frightened me," one neighbour told local media. "The screams were blood-curdling, like she was being slowly murdered."
The woman, who has not been named but is said to be of South American origin, had to be hospitalized after being found in "a state of great mental anguish".
She was discharged hours later after it was confirmed that she had suffered no physical injury.
The woman was reportedly undergoing an ‘exorcism’ in the presence of several other young people and led by a "shamen".
"It absolutely had nothing to do with sanctioned Catholic exorcism," Benito Gallego, dean of Oviedo Cathedral told La Opinión A Coruña.
"It may be that it was some sort of cult ritual, faith healing or voodoo, but is far removed from the exorcism practised by the Catholic Church," he said.
Sanctioned exorcisms are regularly carried out by the Catholic Church in Spain.
