At least nine media workers in Ethiopia’s northern Amhara region have been arrested by local authorities, their employers said Monday, as rights activists warned of a sweep of unlawful detentions. Two outlets – the Nisir International Broadcasting Corporation and Ashara, both covering Ethiopian affairs on their YouTube channels – said their studios in Amhara were raided in recent days and staff taken away, some to undisclosed locations. Nisir said four of its employees, including journalists and back office staff, were arrested and equipment seized from their workplace in Bahir Dar on Thursday…