TUNIS (Reuters) - Six months after Tunisia's uprising, religious tension is rising over the limits of freedom of expression, as Islamists challenge the dominance of liberals in what was once a citadel of Arab secularism.

Last week several dozen men attacked a cinema in Tunis that had advertised a film publicly titled in French 'Ni Dieu, Ni Maitre' (No God, No Master) by Tunisian-French director Nadia El-Fani, an outspoken critic of political Islam.

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