Bommanahalli police have arrested Ravikumar and are interrogating him, Deputy Commissioner of Police (Whitefield) Narayana M said.
"After investigation a clear picture will emerge," he said.
The incident had occurred around 2.15 am on Thursday on the Koramangala-Begur road when the driver took a detour and allegedly groped the woman, a singer, after reaching a deserted spot.
The woman said in her complaint that she managed to get out of the car and started running while shouting for help, following which the driver sped away.
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