crater Credit: Twitter/@ SGIRPC_CDMX 3 Rescue teams were swiftly called to the Xitlevolcano, Mexico

MEXICO CITY( Reuters)-A deadly Mexico City metro collapse in May was caused in part by missing bolts in beams in an overpass that already had deficiencies before a major earthquake, according to an independent auditor's report released on Tuesday by the city government.... 23 but requested a two-week extension to complete its probe.... The metro was built by a consortium of Mexico's ICA, Grupo Carso, a company controlled by the family of Mexican tycoon Carlos Slim, and French trainmaker Alstom