Police in the Bay Area are searching for a 27-year-old man who they say brutally stabbed two sisters at an Oakland train station Sunday night, leaving one of them dead. John Lee Cowell is accused of stabbing 18-year-old Nia Wilson and her 26-year-old sister in the neck and body around 9:30 p.m. at the MacArthur Bay Area Rapid Transit station in Oakland, according to BART police. Wilson died of her injuries at the scene, while her older sister remains in stable condition, officials said. News of the killing stoked public concern that a hate crime had been committed. Cowell is...