PRISTINA, Kosovo (AP) -- A powerful explosion damaged a water canal and temporarily cut water and power supplies to Kosovo's cities, the prime minister said Saturday, blaming groups supported by Serbia. At least eight people were arrested.

Prime Minister Albin Kurti said the blast on Friday in Vrage, 60 kilometers (37 miles) north of capital Pristina, disrupted the supply of water to some cities and major power plants. It followed two other explosions in previous days on buildings of a police station and local authorities in the same area in the north of the country, mostly populated by the ethnic Serb minority.

About 15 to 20 kilograms (30 to 45 pounds) of explosives were used to damage the critical infrastructure, according to Kosovo police chief Gazmend Hoxha.

Kurti blamed "official Belgrade and its criminal structures led by Milan Radoi?i?, supported by Serb institutions and Serbia President Aleksandar Vu?i?."

Radoi?i?, a politician and wealthy businessman with ties to Serbia's ruling populist party and Vu?i?, was among 45 people charged in Kosovo in connection with a gunfight last year in which a Kosovar police officer was killed following an incursion by heavily armed Serb gunmen.

Only three Serbs have been arrested and the others are at large, including Radoi?i?, who Pristina says is protected by Belgrade.

Kosovo police have detained eight people suspected of being part of the attack, according to Interior Minister Xhelal Svecla.

A big cache of weaponry, ammunition, military and police uniforms, cash and other items were confiscated at 10 locations in the north.

Serbia Foreign Minister Marko ?uri? condemned Friday's explosion but also criticized Kurti's "ethnonationalist regime" rushing "to point fingers at Belgrade without evidence."

"We believe that such premature accusations are a deliberate diversion," ?uri? said. "These baseless allegations undermine efforts for constructive dialogue and serve only to escalate tensions in an already delicate situation."

The European Union and the United States strongly denounced the explosion and demanded that the perpetrators are brought to justice.

EU foreign policy chief Josep Borrell spoke on the phone with Kurti to condemn the "despicable act of sabotage on Kosovo's critical civilian infrastructure" and he called "on all stakeholders to cooperate fully with the Kosovo authorities."

The U.S. Embassy in Pristina said that "these violent actions have no place in a democratic society, and those responsible for these criminal attacks against the legitimate authorities of the Republic of Kosovo should be held accountable."

Kosovo President Vjosa Osmani, who canceled a trip to Brunei because of the incidents, met with diplomatic representatives of Western powers and the EU to express her concern that such "attacks aim not only at destabilizing Kosovo but also represent a serious threat to the stability of the whole region."

Kosovo-Serbia relations remain tense despite efforts by the international community to normalize them.

Kosovo was a Serbian province until NATO's 78-day bombing campaign in 1999 ended a war between Serbian government forces and ethnic Albanian separatists in Kosovo, which left about 13,000 dead, mainly ethnic Albanians, and pushed Serbian forces out. Kosovo proclaimed independence in 2008 which is not recognized by Belgrade.

Brussels and Washington are urging both sides to implement agreements that Vu?i? and Kurti reached in February and March last year. They include a commitment by Kosovo to establish an Association of the Serb-Majority Municipalities. Serbia is also expected to deliver on the de facto recognition of Kosovo, which Belgrade still considers its province.

The NATO-led international peacekeepers known as KFOR have increased their presence in Kosovo after last year's tensions.

KFOR has been providing security to the water pipe and to the surrounding areas since Friday night, according to a statement.

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Llazar Semini reported from Tirana, Albania. Du?an Stojanovi? contributed to this report from Belgrade, Serbia.

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