Moscow was targeted by a drone attack Tuesday morning after days of heavy fire on Kyiv, the Russian defense ministry said Tuesday, accusing Ukraine of being responsible.

“The attack involved eight uncrewed aircraft. All the enemy drones were shot down,” the defense ministry said in a statement, calling the event a “terrorist attack.”

The drone attack caused “minor damage to several buildings,” Moscow Mayor Sergey Sobyanin said, adding that no one was “seriously injured” in the attack. The alleged attack comes after three days of heavy Russian drone and rocket strikes across the border in Ukraine.

It is not the first time Russia has accused Ukraine of carrying out aerial attacks on Russian soil.

Earlier this month, Moscow claimed that Kyiv was behind an attempt to assassinate Russian President Vladimir Putin in a drone attack that caused minor damage to the Kremlin. 

However, Ukrainian President Volodymyr Zelenskyy denied the allegations, saying only that “we don’t attack Putin or Moscow. We fight on our territory. We are defending our villages and cities.”

For weeks, Ukrainian officials have been hinting that their forces are preparing for an imminent counteroffensive to retake occupied territory in the east of the country. Kyiv’s armed forces have reportedly carried out “shaping operations” designed to strike Moscow’s logistics and undermine its efforts to wage war.