Six persons including two Rangers personnel and a cop were injured when a Rangers’ check post in Nazimabad suburb of Pakistan’s Karachi came under attack Wednesday morning, (Geo News) reported.According to the rescue sources, the first blast occurred when unidentified miscreants hurled a hand grenade on a Rangers’ check post in Nazimabad area. The other remote-controlled blast occurred just after few minutes of the earlier explosion at the same place.Due to the twin explosions, six persons including two Rangers and a policeman were injured. They were shifted to hospital for treatment.Police reached the spot and cordoned off the area and started investigation.