Sixteen inmates were killed, five others wounded after riots occurred yesterday afternoon in a prison in the northern Mexican state of Zacatecas, local authorities said. A conflict between different groups of prisoners broke out at 2:30 p.m. local time (2030 GMT) at the Regional Center for Social Reintegration in the town of Cieneguillas, about 13 km away from Zacatecas City, the state capital, Ismael Camberos, public security secretary of the Zacatecas state, said at a press conference yesterday evening. Local police soon intervened and managed to put the situation under control...