A former Ukrainian speaker of parliament who was a leading figure in the country's pro-European protest movements in 2004 and 2014 was shot dead on Saturday in western Ukraine, officials said.

Andriy Parubiy, 54, who also previously served as secretary of Ukraine's National Security and Defence Council, was killed in the city of Lviv. Local media reports say he was shot multiple times by a gunman dressed as a courier on an e-bike, according to CBS News partner BBC News .

President Volodymyr Zelenskyy condemned it as a "horrific murder" and said "all necessary forces and means" would be used in the investigation.

Prosecutors have opened a murder probe and said police were still searching for the shooter but have not mentioned possible motives at this stage.

"An unidentified man fired

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