Tensions have been rising inside the new Archidona jail, which has been acting as a temporary migrant detention centre ahead of its formal opening as a prison.
Currently there are some 500 illegal immigrants held there and on Wednesday, sources said, disturbances broke out.
Workers who were supervising had to be withdrawn for their own safety and specialist riot police called in.
According to campaigners against the use of the prison building to house migrants, the increasing unrest is due to the realisation that some will be soon repatriated. “They are aware that they will soon be expelled. After risking their lives to get here, they are not going to make it easy,” said a campaigner. The same sources said that smoke had been seeing coming from the building and noises were heard inside.
Meanwhile a further 53 sub-Saharan boat migrants reached El Hornillo beach near Torre del Mar, east of Malaga, on Wednesday.
So far this year over 2,000 illegal immigrants have arrived by sea along the Costa del Sol, double the number that arrived last year.