discoveries since Monday of five bodies, four of them decapitated, have shattered a period of relative calm and revived concerns that organized crime groups are escalating their battle to control this border city. Two bodies were found Monday morning on a hillside, one with its head placed on its upper back. Three bodies were discovered Tuesday morning in an illegal dump. Their heads, charred from gasoline burns, were placed at their feet, according to the Baja California state attorney general's office. Authorities have not identified the victims in the attacks, which recalled the decapitations two years ago of three Rosarito Beach police officers. Authorities believe that the recent victims might have been associates of the reputed head of the Arellano Felix drug cartel, Fernando Sanchez...