Two loud explosions were heard on Saturday morning in the center of Kyiv, shortly before air warning sirens sounded in the Ukrainian capital, regularly attacked by Russian missiles.
"According to preliminary information, the air defense acted against ballistic weapons. The alert continues, stay in shelters," said the city's mayor, Vitali Klitschko, on Telegram.
"So far no casualties have been reported," he later added.
AFP journalists saw two lines of white smoke in the sky, probably left by two Ukrainian air defense missiles, just before the two explosions.
Air alert sirens then sounded in the capital, last hit at the end of September by Russian attacks.
Last winter, systematic attacks on Ukraine's energy system regularly left thousands of homes without heat.
On Tuesday, Ukrainian President Volodymyr Zelensky said his country had deployed new air defense systems supplied by its Western allies, in anticipation of a new wave of Russian attacks on its energy infrastructure.
