The Catalan government will set up a commission to investigate alleged abuses of “fundamental rights” during Sunday’s independence referendum, regional President Carles Puigdemont said Monday.

Sunday’s referendum was marred by police violence, with the Catalan Department of Health reporting more than 800 people were treated for injuries after clashes with Spanish police.

“The referendum is valid, despite the fear that was inflicted by the police who acted across Catalonia,” said Puigdemont, speaking at a press conference.

One unconfirmed media report claimed that some Spanish Civil Guard officers had been told to identify and photograph Catalan police officers who did not sufficiently comply with orders to stop voters from accessing polling stations.

Spanish police posted videos of clashes between the Catalan regional police, known as the Mossos, from its social media accounts on Sunday.

Puigdemont also reiterated his call for the EU to intervene, despite the European Commission siding with the Spanish courts in judging the referendum as “not legal.”

“The Commission may say this is just an ‘internal affair,’ but basic rights have been violated,” Puigdemont said.

More than 90 percent of the votes cast favored independence. The Catalan government said turnout was 47 percent.

CORRECTION: An earlier version of this article mistakenly attributed information to the “federal police.”