Aukai Collins -- the U.S.-born former Islamic holy warrior, former FBI informant and author of "My Jihad" -- is being held in northern Mexico on weapons and illegal immigration charges after authorities found an assault-style weapon and grenades in his vehicle. Collins is believed to have been working as a bounty hunter, seeking a fugitive from the United States when he was arrested Tuesday by state police in the northern state of Durango, according to the Mexican attorney general's office. Charges against Collins, 29, of Phoenix, and companion Mariel Fernanda Santillan, an Argentine woman who Collins described as his girlfriend,...