Mayoral candidate, young girl among 6 people shot dead at campaign rally in Mexico CBS NewsSix people killed during campaign event in southern Mexico state of Chiapas CNNA mayoral candidate and 5 other people killed in gunfire at a campaign rally in southern Mexico ABC NewsDeadly mass shooting in Mexico; gruesome discovery made in Gilbert home | Nightly Roundup FOX 10 News PhoenixMexico violence: Villagers killed amid cartel clashes in Chiapas BBC.com