Three persons including a Police Officer killed in bomb blast occurredin Mahendranagar area of Dhanusha District in Province No. 2 on December 13, reports Republica.The powerful explosion occurred near a house belonging to Rajeshwor Shah.House owner Rajeshwor Shah (46) and his son Ananda Shah (24) died on the spot.Police Inspector Ameer Dahal deployed from Area Police Office, Mahendranagar was injured in the blast and died while undergoing treatment at BP Koirala Institute of Health Sciences.The blast took place immediately after the Police team reached the site. Three others sustained injuries in the same incident are Police constable RijanMahato, house owner Shah's another son Prakash and daughter Anjali.It was not immediately clear about who placed the bomb.