At least one man was killed and three others injured in an apparent bomb blast in old city area in Karachi on Friday night. The blast was triggered by a bomb planted in a motorcycle that was parked near a trash site in Hindu Parra area of Soldier bazaar, eyewitnesses say. One man was killed in the incident while at least three people have been rushed to the hospital, said an emergency relief worker. Police and bomb disposal squad reached the scene after the blast and initiated the probe into the incident.