Thane, May 21 -- One person was killed and two others were injured on Tuesday when a speeding truck rammed into an autorickshaw on Gandhari bridge in Kalyan. The truck driver who had allegedly fallen asleep at the wheel has been booked for causing death by negligence, said police. According to the police, the accident occurred around 6am when the speeding truck veered into the wrong lane and collided with an autorickshaw coming from the opposite direction. While the auto was crushed due to the impact, the truck broke through the bridge's railing and plunged into the Ulhas river. Among the three persons who were present in the auto when the accident occurred, Mangal Wankhede, a domestic worker, was killed on the spot. Her son Nilesh Wankhede, who works with a private firm in Kalyan and was driving the auto, was injured on his legs while Payal Mane, 22, escaped with minor injuries. Traffic police sub-inspector A Bangar, who was among the first to reach the spot, said he was informed about the accident by a biker. "When I reached, I saw the truck had fallen into the river and the rickshaw was completely crushed," he told Hindustan Times. "The woman was dead, while her son was seriously injured. We pulled him out and as soon as he regained consciousness, he asked about his mother." The police, fire brigade and public works department (PWD) officials soon reached the spot and rescued the truck driver but could not extricate the vehicle from the river. "We assessed the situation and realised that the bridge was too weak to support the weight of a crane to lift the truck," said Namdev Chavhan, a fire brigade officer. "So we decided not to remove the vehicle for now. But we managed to rescue the truck driver safely." The driver will be arrested once he recovers, the police said....