A person suspected of killing General Igor Kirillov, the head of Russia’s biological and chemical forces in the Moscow explosion, has been detained.

Moscow — The Russian security service said on Wednesday that it detained a person suspected of murdering a high-ranking general in Moscow.

The suspect is reportedly an Uzbek citizen recruited by Ukrainian special services.

Russia’s Federal Security Service, or FSB, did not release the suspect’s name, but said he was born in 1995.

Ukrainian security sources told CBS News on Monday that the Security Service of Ukraine (SBU) killed Kirillov in a special operation. The claim could not be independently verified, but Russian officials quickly vowed to retaliate against Ukrainian leaders.

“Kirillov was a war criminal and a perfectly legitimate target because he ordered the use of a banned chemical weapon against the Ukrainian military,” a source familiar with the SBU told CBS News. “Such an honorable end awaits anyone who kills Ukrainians. Punishment for war crimes is inevitable.”

Lt. Gen. It was Igor Kirillov He was killed by a bomb hidden on a scooter on Tuesday Outside an apartment building in Moscow, a day after Ukrainian security services filed criminal charges against him. His assistant was also killed during the attack. The Ukrainian official said that the attack was carried out by the service.

The FSB said that the suspect was promised a reward of 100,000 dollars and permission to move to one of the countries of the European Union in exchange for killing Kirillov.

The agency said that the suspect went to Moscow on instructions from Ukraine and took an improvised explosive device from there. Later, he put the device on an electric scooter and parked it at the entrance of the apartment building where Kirillov lives.

The suspect then rented a car to monitor the location and installed a camera that broadcast live footage from the scene to his handlers in the central Ukrainian city of Dnipro. As soon as Kirillov was seen leaving the building, the suspect detonated the bomb.

According to the statement of the FSB, the suspect faces a “life sentence”.

Kirillov, 54, was the head of the military’s nuclear, biological and chemical defense forces and has been subject to sanctions by a number of countries, including the UK and Canada. Moscow’s military operation in Ukraine. On Monday, the Security Service of Ukraine, or SBU, opened a criminal case against him, accusing him of directing the use of banned chemical weapons.

Russia has denied using any chemical weapons in Ukraine, and in turn has accused Kiev of using toxic agents in the fighting.

Kirillov, who began his current job in 2017, was one of the most high-profile individuals to raise the allegations. He has held numerous briefings to accuse Ukraine’s military of using poison and planning attacks with radioactive materials – claims that Ukraine and its Western allies dismiss as propaganda.

According to Russian news, the bomb used in Tuesday’s attack was detonated remotely. Footage from the scene showed broken windows and burnt brickwork.

Russia’s top state investigative agency said it was investigating Kirillov’s death as a terrorist attack, and Moscow officials vowed to punish Ukraine.