Update 2017-10-27: On Friday (27 October) the Catalan regional government has formally voted for secession from Spain, a move which the Spanish government has declared unconstitutional. Spain has announced its intentions to take direct control of Catalonia, including the control of all executive powers, and dismiss the current Catalan government. Demonstrations and protests with several thousand participants have been taking place in Barcelona and other cities in Catalonia, and are likely to continue. It is as of yet unclear what the exact consequences of direct rule will be, however, the situation may escalate if national security forces are deployed throughout the region.
AFP, dpa, BBC
2017-10-21: On Saturday (21 October), the Spanish government announced its intention to trigger paragraph 155, thus curtailing and possibly suspending Catalonia's autonomy after an independence referendum on 01 October which it declares as illegal. Its goal is to dismiss the separatist government and call for re-elections within six months. During this time, Catalonia would be directly ruled by the Spanish government, including full control of the region’s police, finances, and public media. The decision of the national Senate which has to agree to this step is expected in about a week, a vote has been scheduled for Friday (27 October).
Protests and demonstrations which have already taken place in the past are very likely to continue. Heightened security measures are to be expected. Should its autonomy be suspended, disruptions in public life are to be expected as well. Violent incidents cannot be ruled out. Travellers should follow instructions by local authorities and proceed with caution.
Reuters, Tagesschau, AFP