A group of more than 40 armed men abducted and killed four Mexican policemen Wednesday about 20 miles south of the Arizona border, and the anti-kidnapping chief in another northern Mexico state was reportedly kidnapped. Sonora Gov. Eduardo Bours declined to speculate on a motive for the slaying of the four policemen in his state, but Mexico has seen a wave of attacks on police, military and intelligence officials as the government battles drug trafficking gangs. Full Story