Investigative procedures related to the assassination of former State Duma deputy Denis Voronenkov in Kyiv are under way in the city of Pavlohrad, the Dnipropetrovsk region, the Ukrainian National Police reported on Friday.

"Law enforcement officials are detaining people suspected of involvement in this crime. The detainees are being brought to police stations for further necessary investigative procedures," the National Police said on its website.

"The necessary investigative procedures, including searches, are under way," it said.

The investigative procedures are being handled by the Prosecutor General's Office along with police, it said.

It had been reported earlier that Voronenkov had been assassinated in the center of Kyiv on March 23, 2017; his killer had been wounded by Voronenkov's bodyguard and later died at a hospital.