Filmmaker Siddharth Anand, who is making Bang Bang, has managed to shoot the biggest action sequence ever in Bollywood with actor Hrithik Roshan. Reportedly, Hrithik, who was behind the wheel of an high ended sports car, shot for a chase sequence in Abu Dhabi that involved more than 120 cars. Sources add that the entire sequence was shot in Abu Dhabi and the makers were very careful that the pictures of the chase sequence did not get leaked. The shoot of the sequence was a heavily guarded secret. To ensure this epic chase sequence was carried successfully, Hollywood action director, Andy Armstrong was roped in to shoot it. Before the actual filming, Hrithik did some dry runs of the car he was going to drive. Once he was comfortable with it, they started rolling the cameras. All the cars used in the sequence are high ended cars which were rented from Abu Dhabi. But the car that Hrithik was using remains a mystery. Also starring Katrina Kaif as Hrithik's love interest, Bang Bang is slated