Tunisia’s public prosecutor on Tuesday detained Saadia Mosbah, a prominent activist and head of a nongovernmental group that defends the rights of migrants, human rights groups said, hours after President Kais Saied accused some groups that defend Sub-Saharan migrants of treason. Tunisia has been grappling with asevere migration crisis due to an influx of Sub-Saharan Africans seeking to migrate to Europe in boats. Local media reported that the police began investigating Mosbah, whose group combats racism and defends migrants’ rights, on suspicion of financial crimes. Residents of the southern …