Six people, including a child, were injured in a blast Tuesday in the Russian-held city of Melitopol in southern Ukraine, the pro-Moscow administration said.

Andrei Zhidkov, head of the Russian-controlled city police, said a car loaded with homemade explosives blew up outside a local media company, wounding six civilians, including a 12-year-old.

Zhidkov put the blame on authorities in Kyiv and said an investigation has been launched.

"The actions of the Kyiv regime were once again aimed against the civilian population," Zhidkov said in a statement on Telegram.

Earlier in the day, local officials had said that five people received minor injuries in the blast and one was hospitalised.

Photos showed a grey building block with windows ripped off, burning debris on the ground.

The Telegram channel of the Ukrainian administration in exile showed photos from an explosion.

"This is what the heating in the buildings of collaborationists and propagandists should look like! And it will become hotter" the Ukrainian administration said Tuesday.

The television and radio studio are continuing their work, the pro-Moscow administration said on Telegram.

Blasts are still relatively rare in the southern city of Melitopol, a city seized by Russian troops in the beginning of the offensive.

Melitopol, a city with a pre-war population of just over 150,000 inhabitants, is located in the region of Zaporizhzhia that Moscow claims to have annexed.