In Mexico, at least 20 people were killed in the southern state of Guerrero after gunmen wearing ski masks burst into the town hall in the city of San Miguel Totolapan Wednesday and opened fire during a meeting hosted by the local mayor. The mayor, Conrado Mendoza, was among those killed, as well as his father, who was a former mayor. The gunmen reportedly belonged to a local drug gang that’s in a dispute with a rival drug smuggling group. An investigation of the shooting is underway.