An explosion in Moscow on Wednesday killed three people, including two police officers, Russian investigators said, days after a car bomb killed a high-ranking general not far away.

An official from Ukraine’s military intelligence, known as GUR, told The Associated Press that the attack had been carried out as part of an agency operation. Another official from the agency said the police officers had taken part in Russia’s war in Ukraine, without providing details. Both spoke on condition of anonymity because they were not authorized to speak publicly on the matter.

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