Sajid Nadiadwala's upcoming action-thriller, Phantom, starring Saif Ali Khan and Katrina Kaif, has begun shooting in Mumbai.

The film began shooting in October 2013 in Beirut, Lebanon. During the shoot in Lebanon, the cast and crew were provided security due to the political instability in the country. Saif Ali Khan, who plays the lead role, will be seen speaking lines in Kurdish, which the actor reportedly learned specially for his role.

The movie is about post 26/11 attacks in Mumbai and global terrorism, where Saif Ali Khan and Katrina Kaif play the role of secret agents.

`The shooting for the Mumbai schedule has begun and we can see the movie progressing as envisioned. Both the actors, Saif and Katrina, have worked hard for their roles. Phantom is an intense action-thriller and is sure to keep you at the edge of your seat`, said producer Sajid Nadiadwala.

Produced by Sajid Nadiadwala, Phantom is directed by Kabir Khan and is scheduled for a 2014 release.