The police on Monday beefed up security outside Antilia, Mukesh Ambani’s residence, after a taxi driver informed them that two suspicious-looking men, travelling in a private cab, were asking for details of the building. They have set up nakabandis across the city.

According to police sources, the taxi driver had noted down the license plate number of the private cab, but it doesn’t exist. Hence, all police stations have been alerted for nakabandi across the city.