Police will look into every theory of the death of journalist Pavel Sheremet, Ukrainian Interior Ministry communications department director Artem Shevchenko said.

"Investigators will consider every theory of this cynical crime," Shevchenko told reporters on the incident scene.

"According to the preliminary information, it is a bomb, but we cannot say yet whether it was improvised device. Experts are examining the crime scene," he said.

It is now important to collect all pieces of evidence and to find out every detail of this crime, Shevchenko said. "We will collect video files and material evidence," he said.

Shevchenko said that a criminal case would soon be open but did not say under which article of the Criminal Code. He assured media that law enforcers would focus on solving that crime.

The police have cordoned off the incident scene on the junction of Bohdana Khmelnytskoho and Ivana Franka Streets in Kyiv. Bomb experts are at work.