Sambia, son of a former RJD MLA, was arrested late last night from Park Circus seven-point crossing while he was heading towards his in-laws' house.
According to a Kolkata Police official, Sambia was grilled at Joint Commissioner (Crime) Deabasish Boral's chamber at the Force's headquarter till 5 AM today.
As per the official, Sambia denied that he was behind the wheels of the brand new Audi which mowed down IAF Corporal Abhimanyu Gaud during the rehearsal of Republic Day parade here on January 13.
Sambia's mobile phone tower showed that he was there on January 13 morning, he said.
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In fact, it was through his mobile phone tower location that helped Kolkata Police sleuths to spot him last night, he said.
Sambia was also asked about the number of persons present with him during the incident, to which he had no "clear" answer, the official said.
Sambia was trying to escape to neighbouring states and was constantly changing his hiding places since the accident.
Earlier, an employee of one of the hotels owned by Sohrab in Jorashanko area of the city was called by the police for questioning in connection with Wednesday's mishap. He was later on arrested.
Police had also detained another person for questioning after the incident but allowed him to go.
The brand new white Audi broke three guard rails and barged into the parade rehearsal before fatally hitting the IAF officer.