Catalonia is counting on its regional police force to help carry out a referendum on independence Sunday. Spain says it's counting on the same force to prevent it. The power struggle is the most serious constitutional crisis Spain has faced in nearly four decades. Serious doubts for many Mossos started in July, when the top two regional officials in charge of the police resigned. There could be a part of the Mossos that won't respond," said Luis Mansilla, general secretary in Catalonia of the National Police union SUP.

Source: ABC News September 25, 2017 12:14 UTC