Surat: Katargam police arrested a 24-year-old mobile shop owner after a senior citizen he had knocked down with his speeding motorcycle died during treatment on Wednesday. A 61-year-old victim Dhiru Tapaniya had suffered a fracture in the hand and other body injuries after the accused Navin Shah crashed his bike into him near Lalita Crossroad. Tapaniya was going on foot. CCTV footage of the incident showed that there was no other vehicles on the road and Tapaniya was walking by the roadside. The speeding biker was coming from the opposite direction on the road and he could clearly see the senior citizen, said police. “The motorcycle was at a high speed due to which the victim suffered serious multiple injuries on his body and head. Shah also suffered a fracture in hand,” said a police officer in Katargam police station.