Serbia's president says the European Union has shown "double standards and hypocrisy" in rejecting the Catalan referendum but not the independence of ex-Serbian province of Kosovo.

Aleksandar Vucic said Monday his government supports the territorial integrity of Spain, one of five EU member nations that have not recognized Kosovo.

Kosovo declared independence in 2008, following a brutal 1998-99 war. It was backed by the United States and its allies, but not Russia and China.

But Poland's foreign ministry also described the situation in Catalonia to be Spain's "internal matter," saying "we fully respect the principles of sovereignty, territorial integrity and the unity of the Kingdom of Spain."

The U.N. human rights chief is calling on Spain's government to ensure "thorough, independent and impartial investigations" into acts of violence linked to the Catalan independence referendum.

Zeid Ra'ad al-Hussein says he's "very disturbed" by Sunday's violence in Catalonia. He said police responses must "at all times be proportionate and necessary."

The rights chief said in a statement Monday the situation should be resolved through political dialogue.

Catalan health officials say 893 people were treated in the hospital during Sunday's clashes with riot police who turned up to stop people from voting.

Zeid, a Jordanian prince who goes by his first name, also urged Madrid to accept "without delay" the requests of two U.N.-mandated investigators on freedom of assembly and minorities to be granted access to visit Catalonia.

Rights office spokesman Rupert Colville said the two U.N. "special rapporteurs" had previously sought the access before the weekend's violence.

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