One person was killed and 7 others were injured in a chemical tanker explosion near Shireen Jinnah Colony in Karachi, police and TV channels reported on Saturday. According todetails, the incident took place when the welding work of the tanker was going on, as a result of sudden explosion, two other tankers parked near were destroyed. The rescue team reached the spot and shifted the injured to a nearby hospital. The police lodged an FIR and started further investigation.