The Ukrainian military officer who was killed in a car bomb Tuesday was investigating Russia’s involvement in the war in eastern Ukraine, Ukrainian news outlet reported on Tuesday.

Col. Maxim Shapoval was driving a Mercedes Benz in Kiev when a bomb planted under the vehicle exploded, killing him instantly, according to Kiev police.

Two bystanders were also injured in the explosion.

The Ukrainian Defense Ministry said Shapoval was a part of the Chief Directorate of Intelligence, and Ukrainian media said he was chief of military intelligence’s special forces, according to the Associated Press.