A man accused in four cases was stabbed to death by unidentified criminals in Khulna's Sonagazi upazila today. The victim was identified as Niaz (30), son of Shahjahan, hailing from Choto Baira village of the upazila, reports our correspondent quoting Mamatazul Haque, officer-in-charge of Sonagazi Police Station. The incident took place at Cross road, adjacent to Rubi shop of