KIEV, Ukraine -- Dozens of anti-government protesters, facing Ukraine police officers armed with combat weapons, were killed in a bloody battle for control of central Kiev Thursday.

Dramatic pictures showed protesters cut down by gunfire, Molotov cocktails being thrown and bodies lined up inside a hotel lobby.

Photos: Violence escalates in Kiev (graphic content)

President Barack Obama condemned the scenes and warned President Viktor Yanukovych to withdraw his forces from downtown Kiev immediately.

We are outraged by the images of Ukrainian security forces firing automatic weapons on their own people, Obama said in a statement. We urge the Ukrainian military not to get involved in a conflict that can and should be resolved by political means.

The European Union's foreign ministers decided to impose sanctions against officials in Ukraine on Thursday, a diplomat, speaking on condition of anonymity before an official announcement, said, reported the Associated Press. The list of officials targeted had not yet been established.

Ukraine's Health Ministry confirmed 39 deaths on Thursday, bringing this week's official total to 67. But Svyatoslav Khanenko, the head of an opposition medical service, said more than 60 protesters were killed on Thursday alone. NBC News was unable to independently verify that figure.

Video footage on Ukrainian television showed protesters trying to protect themselves with makeshift shields, teams of protesters carried bodies away on sheets of plastic or on planks of wood.

Acting Interior Minister Vitaly Zakharschenko later authorized police to be given combat weapons, which he said would be used in accordance with the law. He urged protesters to hand in their weapons.

Officials also accused anti-government protesters of taking 67 police officers hostage. Several captured cops were earlier seen being led away by men wearing combat fatigues.

To free the hostages police have the right to use their weapons, the Interior Ministry said in an online statement.

Accounts of the bloody extent of Thursday's violence varied.

The opposition-run Twitter account, @EuromaidanPR, said police snipers had opened fire from buildings above the square and that more than 60 people had been killed. An Associated Press cameraman also saw snipers shooting at protesters in Kiev.

A Reuters photographer, ITV News' James Mates and an Associated Press journalist all reported seeing the bodies of 21 civilians lying on the ground covered by blankets on or near Independence Square.

Anti-government activists blamed the latest flare-up on security forces storming Independence Square using live ammunition. The Interior Ministry said the new violence was triggered when opposition snipers opened fire on police officers. Officials said 30 cops had suffered gunshot wounds.

Opposition leader Vitali Klitschko released a statement saying the only way to end the bloodshed was for Yanukovych told hold early presidential elections.

The crisis in the sprawling country of 46 million has mounted since Yanukovich pulled out of a planned far-reaching trade agreement with the European Union in November under fierce pressure from Moscow and agreed to take a $15-billion Russian bailout instead.

Protests began peacefully last year but have been increasingly characterized by smaller, more extreme elements many aligned with the far right who have clashed with riot police.

While the demonstrations started as a rejection of the Russia-leaning government policies, protesters said they now seek to oust a corrupt and brutal regime, according to a post by the opposition-run Euromaidan Facebook group on Wednesday morning.

Tuesday's clashes -- which left at least 28 dead -- ended weeks of relative calm in the capital and was sparked by Russia's announcement that it was ready to resume its loan package to the Ukraine. Some in the opposition saw this as an indication that the two countries had struck a deal and that the government was intent on standing firm against the protesters.

Ukraine's interim prime minister and Russia's Foreign Ministry have described the violence as an attempted coup.

Klitschko, the world champion boxer turned opposition leader, had backed the cease-fire with Yanukovych in a statement on his party's website Wednesday night.

But other anti-government factions, such as Dmitro Yarosh, the leader of Ukraine's far-right Pravy Sector party, rejected the agreement and vowed to continue to fight.

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