By: Anna Chernova, Alessandra Freitas, Darya Tarasova

Moscow’s mayor says a bomb blast that killed two people and injured 21 others at a restaurant was a “terrorist attack.”

An unidentified woman attempted to enter a private event at the Balzi Rossi restaurant on Kudrinskaya Square carrying what authorities believe was an improvised explosive device, state media reported. The bomb went off before she entered, killing the security guard who stopped her, and a customer.

Authorities did not immediately identify the woman and it was also unclear whether she deliberately detonated the device.

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Moscow mayor Sergei Sobyanin said, “Yesterday, a brutal terrorist attack took place in Moscow, claiming the lives of several people.”

“Those responsible for this crime will certainly be found and will face the punishment they deserve,” he added, giving no details on a motive or who might be behind the attack.

The apparent targets were guests attending a private event on the restaurant’s outdoor terrace, Russian business daily Kommersant reported. Sources told the newspaper that the event was heavily guarded, which may have prevented a significantly higher death toll.

Kommersant said a security guard became suspicious of a courier approaching with a box she described as a gift and decided to search her. The device exploded at that moment.

Investigators believe the bomb was detonated remotely, and a preliminary account indicates that the woman most likely did not know what the package contained, Kommersant reported.

The device had the explosive force of one kilogram of TNT and was packed with metal ball bearings intended to increase casualties, according to the newspaper.

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The blast happened around 8:10 p.m. local time (1:10 p.m. ET) near the outdoor terrace, according to Russian state news agency TASS, which cited the Main Directorate of the Ministry of Internal Affairs. The restaurant is located at the base of a landmark tower on Kudrinskaya Square, one of Moscow’s famous “Seven Sisters,” a group of Stalinist skyscrapers built in the 1950s.

The explosion immediately prompted the deployment of an investigative task force and a large number of police and emergency personnel to the site, which sits along the Garden Ring in Moscow’s central Presnensky district.

The restaurant said it was “deeply saddened by the tragedy and extends its sincere condolences to the families and loved ones of those who were killed.”

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