A construction worker died when a chemical drum exploded at Rajoir Upazila in Madaripur on Sunday. The deceased was identified as Emon Munshi (22). Two others were seriously injured in the same incident.  Also read: Man killed as gas cylinder explodes in Barguna ice factory According to police and local sources, some workers started work on a three-storey under construction building on Saturday morning.  Around noon, Emon and his associates tried to open the mouth of an old chemical drum on the roof of the building with an iron device, which  caused a sudden explosion. Emon died on the spot.  Also read: Four friends at tea stall burnt as gas cylinder explodes Two other workers, Enamul Munshi (19) and Zahirul Islam (29) were seriously injured. Officer-in charge of Madaripur Rajoir police station Anwar Hossain confirmed the news to UNB.