Ukrainian sources tell the BBC the country's security service was behind the killings.

A high-ranking Russian general in charge of the Kremlin's nuclear forces has been killed in an explosion in Moscow.

Lieutenant General Igor Kirillov, a high-ranking official in charge of radiation, chemical and biological defence troops, died in the blast moments after he emerged from his apartment block

Senior Russian general killed by bomb in electric scooter, investigation underway, photos show aftermath, criminal case opened.

A senior Russian general was killed Tuesday by a bomb hidden in a scooter outside his apartment building in Moscow, a day after Ukraine’s security service leveled criminal charges against him. A Ukrainian official said the service carried out the attack.

Lieutenant General Igor Kirillov, 54, died early on Tuesday after a device hidden inside a scooter was detonated as he emerged from his apartment block - with his driver also killed

An explosive device planted near an apartment building in Moscow killed the head of Russia’s nuclear and chemical forces early Tuesday, officials said. Russia’s Investigative Committee said the bomb, which was triggered by the device placed in a scooter, killed Lt. General Igor Kirillov and his assistant. Kirillov, who was named the head of Russia’s nuclear defense forces in April 2017, was under sanctions from several countries including the U.K. and Canada for his role in Ukraine.

Kirillov, who has been killed in Moscow, was accused by the West of overseeing the use of chemical weapons on the battlefield in Ukraine.

A Russian general accused of using banned chemical weapons in Ukraine was assassinated early Tuesday in Moscow by a remote-controlled bomb planted in an electric scooter, Reuters reported. Lt. General Igor Kirillov, head of Russia’s nuclear, biological and chemical defense forces, died along with his assistant when the bomb was set off outside an apartment building in the Ryazansky Prospekt neighborhood, Russia’s Investigative Committee, which handles serious crimes, said in a statement.

Attacks on Russian figures have become more brazen as Ukrainian special services penetrate security in Moscow.

Scooter containing explosives was detonated, killing both Kirillov and his aide, as they stepped out of a building.

Moscow, Dec 17 (IANS): Russia’s Radiological, Chemical, and Biological Defence Forces chief, Lt General Igor Kirillov, was killed in a bomb blast in southeastern Moscow early on Tuesday, with top Russian leaders blaming Ukraine for the crime, reports said. Russian authorities reacted strongly to the incident, saying.....

Igor Kirillov was killed by a remote detonated bomb hidden in an electric scooter, Russia has vowed revenge.