Sewa Singh Mandla, chairman of Sikh Gurdwaras, said he did not condone what had happened at the theatre but protesters had been provoked.
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The petition gained the backing of 150 Gurdwaras - the main Sikh religious institutions - and over 200 Sikh organisations and 70 non-Sikh organisations.
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At temples, or gurdwaras, where Sikhs hold services, everyone is welcome.
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