The attack at Pakistan Naval Station Mehran,leaves four killed and nine injured.Sources said 10 to 15 terrorists stormed the PNS Mehran building exploding bombs and firing indiscriminately and targeting aircraft’s and ammunition depot.Pakistan Naval commandos have started backlash against the attackers and according to reports four terrorist have been killed while one has been arrested. on the other hand, four officials including a Lieutenant and a fire man has been killed while nine have been injured in the attack.There are reports that several PAF planes have suffered significant damage due to explosions.Law enforcement agencies and rescue teams have arrived at the scene and state of emergency has been declared in all Karachi hospitals.It is pertinent to mention here that the Pakistan Tehreek-e-Insaf is staging a sit-in in Karachi at Netty Jetty Bridge. A large number of PTI workers along with PTI Chief Imran Khan are participating in the sit-in against the US drone attacks in the tribal areas of Pakistan. – Dunyanews