Dhaka, May 19 -- Export and import operations of Bangladesh have been severely disrupted due to continuous pen down strike programme of the officials of the National Board of Revenue (NBR) continued for the fourth consecutive day on Sunday in protest against the recently issued ordinance abolishing the organisation. Business community warned saying continuations of such situation could harm export business seriously. They also warned that it also might lead to a shortage of essential commodities in the local market and a delaying in releasing imported raw materials could create breakdown in the industrial production cycle due to.NBR sources said, officials from 25 customs stations-including Chattogram and Mongla ports and the Kamalapur Inla...