Mayor calls upscale restaurant bombing a 'brutal terrorist act' after 3 killed, 21 injured

A bombing at an upscale restaurant in Moscow that killed three people and wounded at least 21 others on Saturday was a "brutal terrorist act," according to the city’s mayor, who vowed to hunt down those responsible for the attack.

Moscow Mayor Sergei Sobyanin made the declaration Sunday, a day after the explosion tore through the Balzi Rossi Italian restaurant in the Russian capital.

"Yesterday, a brutal terrorist act was committed in Moscow that claimed human lives. The victims are currently in the city’s hospitals, where they are receiving all necessary care," Sobyanin wrote on social media Sunday.

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He added investigators are working to identify those behind the attack and vowed they "will certainly be found and will face the punishment they deserve."

Russian authorities have not identified any suspects, and no group had claimed responsibility as of Sunday.

Russia's National Anti-Terrorism Committee said the blast was caused by a homemade explosive device. Russian state news agency RIA Novosti, citing local officials, reported that a woman carrying the bomb tried to enter the restaurant but was stopped by a security guard before it exploded.

The blast killed the woman, the security guard and a restaurant patron, RIA Novosti reported. At least 21 other people were injured in the explosion, which happened around 8 p.m. local time at the restaurant on Kudrinskaya Square.

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The restaurant was closed to the public Saturday night for a private event, according to its website and Russian state media.

Video released by Russian state media showed heavily armed police officers, ambulances and other emergency vehicles outside the damaged restaurant as investigators examined the scene.

Earlier this year, Russia's Federal Security Service, or FSB, said it would tighten security for senior military and government officials following a series of assassination attempts in Russian cities since the Kremlin launched its full-scale invasion of Ukraine in February 2022.

Russian authorities have not linked the restaurant bombing to those earlier attacks or to the war in Ukraine.

Fox News Digital’s Brie Stimson and The Associated Press contributed to this report.