Tear gas and chaos shuts down Nigeria's parliament

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ABUJA, Nov 20 (Reuters) - Nigerian police fired tear gas and prevented the speaker of the lower house of parliament, who has defected to the opposition, from presiding over a session on Thursday.

Senate President David Mark shut down the national assembly, postponing debate on a bill to extend a state of emergency in three states hit by insurgency, after the chaos erupted. (Reporting by Felix Onuah; Writing by Bate Felix; Editing by Ruth Pitchford)