She'd just performed to thousands at London's iconic O2.

And Madonna reportedly wanted to ensure her journey to her West London home was as smooth as possible after her gigs on Tuesday and Wednesday this week.

Pictures taken after the concerts finished, show the pop superstar sat in the back of her chauffeur driven car, with red and blue lights mounted on the dashboard, as fans accuse her of using a 'fake police car' to cut through the busy traffic.

http://i.dailymail.co.uk/i/pix/2015/...9225581774.jpg

According to Nicola Fahey for The Sun, fans claim Madonna was sitting in the back of the car on both nights, which travelled between two other vehicles.

Concert-goers trying to leave the busy arena carparks after the the gig finished at 11pm were allegedly forced to move out of the path of the convoy as it made its way through, with some believing Madonna's vehicle was an unmarked police car.

http://i.dailymail.co.uk/i/pix/2015/...9225791648.jpg

One fan told The Sun: 'Nobody was moving, then all of a sudden there's this huge commotion and I saw flashing lights and heard a horn beeping. Then I saw a car and we figured it was an undercover cop. It was beeping so all the traffic let it through.

'Some drivers were really annoyed. Then I looked into the car and saw Madonna. She's being driven out with a flashing light sat on the dashboard.'

It is an offence to install flashing lights on a car, with drivers, not passengers, facing up to six months in prison if convicted of impersonating a police officer.

http://www.dailymail.co.uk/tvshowbiz...c-O2-gigs.html