A senior Kolkata Police officer said, Sachin Shah, who is employed in one of the hotels owned by Sohrab in Jorashanko area of the city was first called for questioning in connection with Wednesday's mishap and later on arrested.
"Going by what has emerged from our investigations we are somewhat sure that it was Sambia who was driving the car that killed Corporal Abhimanyu Gaud, the IAF drill instructor," the officer said.
Police had also picked up another person for questioning after the incident but later allowed to go.
Asked about the number of passengers present in the car at the time of accident, the officer said it cannot be divulged for the sake of investigation.
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On the search for the Sohrabs, he said around ten places in the city, including hotels owned by them, were raided today but no trace of the trio was found.
He, however, denied that any team of sleuths of the force have been sent to the neighbouring states for the trio.
Kolkata Police and the Indian Air Force are in "constant touch" with each other regarding the developments in the probe, he added.