Kareena Kapoor and Shahid Kapur were mobbed by fans while shooting for Imtiaz Ali's yet untitled love story at a railway station in Shimla.

"The incident happened at the Shimla railway station which was initially secluded and quiet but in an hour's time word spread that a film was being shot there and people started pouring in," said Parag Desai, spokesperson for Shree Ashtavinayak Cine Vision Ltd., which is producing the film.

The crowd became so uncontrollable that the director had to call off the shooting. The actors were bundled away from the spot and the police were called.

"Suddenly, there was a sea of people. They would just not let the actors do their work. We had to quickly get Kareena and Shahid away as things were getting out of hand. The shoot had to be stopped for that day.

"The cops arrived and dispersed the crowd and shooting resumed only to be stopped again. Some portions of the film were then shot in the nearby mountains to avoid the milling crowd," added Desai.

The film is mainly shot in Punjab and the unit had to face this problem there as well.

"It happened wherever they went. It could also be that such areas don't chance upon big stars so they go berserk. In Patiala too there was an exterior shot which had to be cancelled due to crowds," said Desai.

Ali's film is slated to release by the end of this year. He has earlier directed the Ayesha Takia and Abhay Deol starrer "Socha Na Tha".