A senior Russian military officer was killed when a car exploded in the Moscow region.
Russia's Investigative Committee said Yaroslav Moskalik was killed in the blast in the town of Balashikha.
The Investigative Committee said Moskalik was the deputy head of the Main Operations Directorate of the General Staff of the Russian Armed Forces.
"According to available data, the explosion occurred as a result of the detonation of a homemade explosive device filled with destructive elements," the Investigative Committee said in a statement.
Russia's Investigative Committee said Yaroslav Moskalik was killed in the explosion
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Local media published video footage showing a person approaching a line of parked cars outside an apartment complex and an explosion that sent parts of a vehicle flying metres into the air.
Kommersant newspaper said a second person was also killed.
Moskalik, who held the rank of major general, had participated in several high-level Russian delegations, according to defence ministry bulletins and media reports.
He joined the Russian contingent in a meeting in October 2015 of the Normandy Format, a group made up of teams from Germany, Russia, Ukraine and France who oversaw the Minsk agreements designed to end the war between Ukraine and Russian-backed separatist forces that broke out in 2014.
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Moskalik represented the army's General Staff at the negotiations alongside Foreign Minister Sergei Lavrov and Kremlin aide Yuri Ushakov, according to the Kremlin website.
Russia's RBC newspaper listed Moskalik as a participant in the security subgroup in the Minsk talks.
In December, Ukraine's SBU intelligence service used a bomb hidden in an electric scooter to kill Lieutenant General Igor Kirillov, whom Kyiv accused of being responsible for the use of chemical weapons against Ukrainian troops.
