PANCHKULA, Jan 14: Three persons were killed while several others were injured in two separate incidents near here. Police sources say that a speeding truck, coming from the stone crushers near Chandimandir, rammed into a wrongly parked truck. Two labourers sitting in the truck, identified as Rajesh and Shekhar, were killed on the spot, while two others were injured.In another incident, two scooterists were knocked down near the Pinjore Aviation Club by a Canter. One of them, Charanjit died on the spot, while the other rider is in a critical state.