KREMENCHUK, Ukraine (AP) — Russian long-range bombers fired a missile that struck a crowded shopping mall in Ukraine’s central city of Kremenchuk on Monday, raising fears of what President Volodymyr Zelenskyy called an “unimaginable” number of victims in “one of the most daring terrorist attacks in European history.”

Zelenskky said more than 1,000 civilians were inside the mall, with many managing to escape. Images from the scene showed giant plumes of black smoke, dust and orange flames, with emergency crews rushing in to search broken metal and concrete for victims and put out fires. Onlookers watched in distress.

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The casualty figures were difficult to determine as rescuers searched the smoldering rubble. The regional governor, Dmytro Lunin, said at least 13 people were dead and more than 40 wounded.

At Ukraine’s request, the U.N. Security Council scheduled an emergency meeting in New York on Monday evening to discuss the attack.

The missile strike unfolded as Western leaders pledged continued support for Ukraine, and the world’s major economies prepared new sanctions against Russia, including a price cap on oil and higher tariffs on goods. Meanwhile, the U.S. appeared ready to respond to Zelenskyy’s call for more air defense systems, and NATO planned to increase the size of its rapid-reaction forces nearly eightfold — to 300,000 troops.