Last week, the Catalonia region of Spain held an independence referendum, which passed overwhelmingly but was regarded as illegal by the Spanish government and suffered from low turnout. The run-up to the vote was marred by a police crackdown on polling places, and in the aftermath large-scale anti-independence demonstrations were held in Barcelona, the capital city of Catalonia.
The Catalan independence movement has been active for most of the 20th century, though it was suppressed during the dictatorship of Francisco Franco. A previous independence referendum was held in 2014.
Catalan leader Carles Puigdemont plans to address the Catalan parliament on Tuesday.