In front of the headquarters of the Spanish Civil Guard in [[Passeig de Gràcia, Barcelona|Passeig de Gràcia]] a demonstration of 150 people shouted slogans in favour of the police operation, the unity of Spain and against holding a referendum vote. During the demonstration there were clashes with the [[Mossos d'Esquadra]] when the protesters tried to stop the traffic.<ref name="Against">{{cite news |editor= ACN|date= 21 September 2017|title= Més de 150 persones es manifesten a favor de la Guàrdia Civil a la caserna de Travessera de Gràcia |trans-title= More than 150 people demonstrate in favour of the Spanish Civil Guard in the headquarters in Gracia |url= http://elmon.cat/noticia/232668/mes-150-persones-manifesten-favor-guardia-civil-caserna-travessera-gracia |language= Catalan |work= El Món |location= Barcelona |access-date= 23 September 2017}}</ref>
An open letter from several members of all parties in the UK parlamentparliament expressed their concern "by the measures taken by the Spanish government to prevent the referendum"<ref name=":0">{{Cite news|url=http://www.theguardian.com/world/2017/sep/21/spains-dangerous-bid-to-block-catalan-vote|title=Spain and the Catalan referendum {{!}} Letters|last=Letters|date=2017-09-21|work=The Guardian|access-date=2017-09-25|language=en-GB|issn=0261-3077}}</ref>. An additional open letter from over a hundred academics of law, human rights and related subjects from the UK and Ireland expressed the same level of concern about the fact "that the level of political repression in Catalonia is of a severity and arbitrary character not experienced since the Franco dictatorship"<ref name=":0" />. The [[Regional Council of Sardinia]] also unanimously approved a motion on 21 September 2017 expressing solidarity with Catalonia and offering to print and store the necessary ballots for the referendum while asking the international community to intervene and ensure that Catalans could vote and decide on their self-determination.<ref>{{cite news |date= 22 September 2017 |title= Sardenya s'ofereix a la Generalitat per facilitar el material del referèndum |trans-title= Sardinia offers to provide referendum material to Generalitat of Catalonia |url= https://dbalears.cat/horitzons/2017/09/22/306223/sardenya-ofereix-generalitat-per-facilitar-material-del-referendum.html |language= Catalan |work= Diari de Balears |location= [[Balearic Islands]] |access-date= 23 September 2017}}</ref><ref>{{cite news|url=http://www.ansa.it/sardegna/notizie/2017/09/22/catalogna-sit-in-indipendentisti-sardi_9b144a29-4f2d-4e73-b17b-a9bbdd11dc25.html|title=Referendum Catalogna: sit-in indipendentisti sardi a Cagliari|last=|first=|date=22 September 2017|work=Sardinia Post|access-date=23 September 2017|archive-url=|archive-date=|dead-url=|location=Sardinia|language=Italian|trans-title=Catalonia referendum: Sardinian independents sit in Cagliari}}</ref>
