Movie theatres in Mumbai have closed down advance bookings for Shah Rukh Khan's upcoming film 'My Name is Khan', fearing attacks by Shiv Sena activists. <br/>Shiv Sena activists continued to attack several cinema halls in Mumbai and Maharashtra that were supposed to screen Shah Rukh's film. <br/>The party stepped up its protest against the film over the actor's remarks favouring inclusion of Pakistani cricketers in IPL. <br/>Several protesting Shiv Sena activists have been detained so far by the Mumbai police as part of preventive measures. <br/>AIR Mumbai Correspondent reports, as the countdown started for the release of Shah Rukh Khan's movie, `My Name Is Khan', Shiv Sena activists went on a rampage in several areas of Mumbai protesting against the movie and ransacking theatres and multiplexes. <br/>The police continued to detain several Shiv Sainiks for protesting outside the theatres, vandalising screens, for rioting, unlawful assembly and criminal intimidation. <br/>Sending a stern message to the Sena, Chief Minister Ashok Chavan has threatened to withdraw the security of Shiv Sena executive president Uddhav Thackeray, unless the party stopped attacking theatres. <br/>In a fresh development, several multiplexes and single screen theatres across the city including Cinemax, Big Cinema, Fun Republic and Adlabs have stopped advanced booking of the 'film My name is Khan' fearing demonstration and damage by the Shiv Sena activists. <br/>Meanwhile Shiv Sena activists continued their protest and attacked theatres in Kandivli and Juhu suburbs on Wednesday to stall the release of the film. Khan has already refused to apologise for stating that Pakistani cricketers should have been included in the IPL tournament, but he has also sought to close the issue with the Sena. <br/>