Hinstein: Six people, including a child, died in the Ukrainian rocket attack on Rilsk

Six people, including a child, were killed Friday in a Ukrainian missile attack on the city of Rilsk in Russia's Kursk region, acting governor Alexander Hinstein said, Reuters reports.

Ten wounded, including a 13-year-old boy, were taken to the hospital with minor injuries, Hinstein wrote on Telegram.

"What happened today is a huge tragedy for all of us. We mourn together with the families of the victims. No one will be left without support. Those responsible will receive the deserved retribution," he said.

Russia's permanent representative to the United Nations (UN), Vasiliy Nebenzya, later said at the Security Council session that Moscow would quickly respond to the "unequivocal move of the regime in Kiev."

"As you well understand, our response to this targeted crime against peaceful citizens of Russia will not take long," he said at the session.

Ukrainian authorities have not commented on the incident.

Hinstein said Ukraine fired United States-supplied HIMARS missiles, damaging several buildings, including a school, recreation center and private residences in Rilsk, about 26 kilometers from the border with Ukraine's Sumy region.

According to an unconfirmed earlier report by Mash, a Telegram channel close to Russian law enforcement, the death toll was seven.

The channel released an unverified video showing damaged buildings and burning cars on a city street.

Hinstein, later on Telegram, said the attack also disrupted heating and gas networks and that work was underway to restore supplies to more than 80 apartments.

Ukrainian troops still hold part of the Kursk region after crossing the border in a surprise attack on August 6.

Russian President Vladimir Putin said during his annual press conference on Thursday that Ukrainian soldiers would be expelled, but declined to set a date.

Hinstein, who was a member of the State Duma until Putin appointed him acting governor of Kursk earlier this month, accused Kiev of deliberately targeting civilians in the attack.

Both Ukraine and Russia regularly accuse each other of attacking civilians, and both deny doing so.

Tensions between the warring parties have risen since Tuesday, when senior Russian general Igor Kirilov was killed in a bomb attack in Moscow. The Ukrainian intelligence service SBU claimed responsibility for the assassination.