Ukrainian President Volodymyr Zelensky said he has ordered the head of Ukraine’s SBU security service to carry out an “appropriate and tangible” response to a Russian drone strike against the agency’s headquarters in central Kyiv on Friday afternoon.

In a post on X, Zelensky wrote that a Russian drone took direct aim at the office of SBU chief Oleksandr Poklad.

Ukrainian media reported that Poklad was not in his office at the time of the attack, which took place at around 3:30 p.m. local time.

Heavy black smoke was seen rising in central Kyiv following the strike, which Ukraine’s foreign minister described as a major escalation of the war.

Kyiv Mayor Vitali Klitschko said at least seven people were injured in the attack.