The Spanish government took a strong stance against the referendum ahead of the vote by raiding offices, shutting down pro-independence websites, and arresting officials.
In this Sunday, 1 October 2017 photo, Spanish National Police scuffle with people trying to reach a voting site at a school assigned to be a polling station by the Catalan government in Barcelona, Spain.
About 80% of Catalonians voted to separate from Spain in a separate independence referendum in 2014, but that was non-binding.
"Police responses must at all times be proportionate and necessary", he said in a statement.
"If anyone in the federation believes I should not be there, I will step aside".
Thousands of people took to the streets and blocked roads across Catalonia yesterday amid strikes to protest against the police violence used during the weekend's divisive independence referendum. "We trust the leadership of Prime Minister Mariano Rajoy to manage this hard process in full respect of the Spanish Constitution and of the fundamental rights of citizens enshrined therein", the commission said, in a statement.
All eyes were on the Catalan government as it considered its next move. Final votes were still being counted Monday. Many of those opposed to independence are thought to have stayed at home after the referendum was deemed illegal by Spanish courts. During Spain's June friendly against Colombia in Murcia, a city in southeast Spain, he was jeered by supporters who oppose Catalonia independence. "This moment needs mediation", he said. "Each week, after every mistake, we've gained more support from society; a bigger majority in Catalonia who do not accept this situation".
"It's the biggest day of gratuitous violence that we've experienced in the past 40 years", Puigdemont said, referring to the four decades of democratic rule in Spain.
"Right now, what we need between Catalonia and Spain is words, good manners and compassion", he said.
Catalan President Carles Puigedemont has pledged to send the referendum results to Catalonia's parliament, which had previously vowed to declare independence within 48 hours of a "Yes" vote.