DERA ISMAIL KHAN: At least nine people including four policemen were killed and scores of others were injured in shooting and blast attack in Dera Ismail Khan, ARY News reported on Sunday.br br A suicide blast at District Headquarters Hospital Dera Ismail Khan also injured 15 people.br br At least two policemen were martyred when armed terrorists opened fire at a check post in Dera Ismail Khan district. According to reports, incident took place at Kotla Syedan police post in DIK district.