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The remote-controlled roadside bomb exploded close to the site where a Friday bomb attack killed three soldiers from the Rangers paramilitary force. Police said the target of the attack was not immediately clear, but the bomb exploded when a vehicle of Rangers was passing near Karachi University. "It was a planted bomb. Two passers-by were injured," Salam Sheikh, a senior police officer, told AFP. A spokesman for the Rangers said that troops remained unhurt in the incident.