Twelve Catalan separatist leaders will go on trial in Madrid on Tuesday, accused of rebellion for a referendum on Catalonia's independence in 2017.

The referendum was not sanctioned by the government in Madrid, and violence broke out around the voting. Assigning blame for that will be a focal point of the trial.

The case is being heard as the government continues to face criticism over its attempts to hold talks with Catalan separatists to try to defuse the crisis.

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