Catalans began voting Sunday in a banned independence referendum, while police seized the ballots of at least one polling station. Spain's Constitutional Court suspended the vote and the Spanish central government says the vote is illegal.
In Photos: Catalonia Independence Referendum

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Spanish National Police prevents people from entering a school assigned to be a polling station by the Catalan government in Barcelona, Oct. 1, 2017.

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People queue to vote at a school listed to be a polling station by the Catalan government in Barcelona, Spain, Oct. 1, 2017.

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A man holds ballots at a polling station for the banned independence referendum in Barcelona, Oct. 1, 2017.

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Catalan Mossos d'Esquadra officers walk while parents camp out at the entrance of the occupied Reina Violant elementary school, one of the designated polling stations, before the banned Oct. 1 independence referendum in Barcelona.