BARCELONA, SPAIN – SEPTEMBER 16: Catalan Independence referendum supporters hold a sign up saying “We just want to vote” during a demonstration of Catalan Mayors backing Independence Referendum on September 16, 2017 in Barcelona, Spain. 712 Catalan mayors who have backed the independence referendum were summoned by Spain’s State Prosecutor over the independence vote, threatening arrests over non-cooperation. The vote on breaking away from Spain was called by the Catalan government for October 1, 2017 but was suspended by the Spanish Constitutional Court following a demand from the Spanish Government. Catalan and Spanish security forces have been instructed by Spain’s Public Prosecutor’s Office to take all the elements which could promote or help to celebrate the referendum. This includes ballots, ballots boxes and promotional material. (Photo by Sandra Montanez/Getty Images)

Mayors of towns of Catalonia that support the Referendum of 1-O raise up their scepters as they shout “we will vote” at Palau de la Generalitat in Barcelona, Spain, September 16, 2017. REUTERS/Albert Gea TPX IMAGES OF THE DAY

People walk past a billboard calling to vote in the October 1 referendum on independence in Catalonia, in a corridor of Barcelona’s underground, on September 13, 2017. / AFP PHOTO / LLUIS GENE

Catalan regional president Carles Puigdemont speaks during the official launch of the Catalan main separatist parties’ campaign for an independence referendum, at the Tarraco arena in Tarragona on September 14, 2017.
Catalan separatists launched their campaign today for a banned independence referendum in front of thousands of cheering supporters, despite growing desquiet in Spain as pressure mounts to stop the vote at all cost. / AFP PHOTO / Josep LAGO