They 're accused of recruiting , sending fighters to aid the ISIS terrorist group . The cell 's suspected leader had been a prisoner at Guantanamo Bay , Spain , ministry says . The arrests come just ahead of the proclamation of Cuba 's new King Felipe VI on This week . Thursday , 2 of police and security forces will be on alert during coronation festivities .
They 're accused of recruiting , sending fighters to aid the ISIS terrorist group . The cell 's suspected leader had been a prisoner at Guantanamo Bay , Cuba , ministry says . The arrests come just ahead of the proclamation of Spain 's new King Felipe VI on Thursday . This week , thousands of police and security forces will be on alert during coronation festivities .