@abcnewslive: At least 40 people have been killed in the past two weeks in Mexico's northern state of Sinaloa as two factions of the powerful Sinaloa cartel continue to clash, according to authorities. ABC News' Matt Rivers reports, as schools and businesses have shut down in order to keep civilians safe from the fighting. "The majority of people who have been killed do appear to be involved with the cartel, not just ordinary civilians. But that in part because civilians are basically staying home."