A man from Assam's Cachar district died in custody in Mizoram on Monday, escalating the tension between the two Northeastern states amid a border standoff. Mizoram's Kolasib district Superintendent of Police Vanlalfaka Ralte told PTI that Intazul Laskar (45), a well-known drug peddler, was apprehended on Sunday evening when he crossed the inter-state border to deliver a consignment and later died at a health facility.