Slovak Prime Minister Robert Fico is said to be in a "life-threatening condition" after he was shot and wounded.
Several shots were heard, before his security detail bundled him into a nearby car.
The Slovak leader has been taken to hospital and his alleged assailant detained by police.
US President Joe Biden has condemned the shooting as a "horrific act of violence".
Russian President Vladimir Putin said the attack was a “monstrous crime”.
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