The arrest announcement follows the death of Russia's Lt. Gen Igor Kirillov, who was killed on Dec. 17 by a bomb hidden on an electric scooter parked outside his apartment building.

MOSCOW (AP) — Russia's top security agency said Thursday that it has arrested several suspects accused of involvement in an alleged Ukrainian plot to assassinate senior military officers, an announcement that follows the killing of a top Russian general last week.

The bombs were disguised as an electric scooter, a document folder and a magnetized portable charger, Russia's Federal Security Service said.

Overnight, Russia launched 24 drones from inside Russia, as well as two Iskander-M ballistic missiles from Voronezh and Kursk oblasts, Ukraine’s Air Force reported.