Ethiopian police have arrested more than 80 people and seized weapons amid government allegations that opposition groups are plotting a coup d'etat. The state-run news agency report on Tuesday came just one day after 43 opposition members had been detained for alleged subversion in northern Tigray state. The official Ethiopian News Agency (ENA) said dozens more had been arrested on similar charges in southern Oromia state and another three south of the capital. In a brief item that offered few specifics, the agency quoted Oromia police as saying they had arrested 80 people believed to be opposition supporters had seized 160 illegal weapons in raids in the towns of North and East Shoa. "The illegal arms and the people were apprehended through house-to-house searches after the police were tipped by members of the public," ENA quoted North Shoa deputy police commander Tesfaselassie Negera as saying.