Russia's security service says a 29-year-old man from Uzbekistan has been detained over the killing of senior general Igor Kirillov and his assistant in Moscow. Lt Gen Igor Kirillov, head of the Radiation, Chemical and Biological Protection Forces, was outside a residential block early on Tuesday when an explosive device hidden in a scooter was detonated remotely. The Russian security service said the unnamed suspect was recruited by Ukrainian intelligence, according to state media agencies. Ukraine's security service had already claimed it was behind the killing, a source told the BBC on Tuesday.