quetta pakistan suicide bomber kill senior pakistani police official way work two others thursday restive southwestern province baluchistan officials say baluchistan rock series attack late last year claim 180 live raise concern grow militant presence include fighters affiliate islamic state claim several bomb province violence raise concern security project 57 billion china pakistan economic corridor plan transport energy link western china pakistan southern deep-water port gwadar three individuals embrace martyrdom include additional inspector general hamid shakeel driver provincial government spokesman anwar ul haq kakar tell reuters spokesman tehreek-e-taliban also know pakistani taliban claim responsibility attack shakil way work provincial capital quetta suicide bomber intercept vehicle baluchistan police inspector general moazzam jah tell reuters one police officer kill three officials seriously wound add attack security officials baluchistan accelerate four suicide bomb one arm attack target police past six months bomb kill three include senior police official restive southwestern pakistan