Six people have been killed and 60 other injured after a fire broke out inside a firecracker factory in Madhya Pradesh's Harda. The flames triggered several explosions, sparking panic in the nearby areas. The injured have been rushed to hospital and some of them are in a critical condition, said an official. The intensity of the blasts was such that people in the adjoining Seoni Malwa area in Narmadapuram district said they experienced tremors.