The woman, whose identity police has refused to reveal, had arrived here from Denmark two days ago on a business trip, they said.
Last evening, after finishing her business meeting in Sector 63 market she was returning to her hotel in a car of a company owner.
When they reached Sector 50 market, two men on a motorbike threw something inside the car, following which smoke filled the vehicle and they started coughing, police said.
An FIR has been lodged and efforts are on to nab the accused, he added.
Disclaimer: No Business Standard Journalist was involved in creation of this content