Russian forces have shelled a mosque in the southern Ukrainian port city of Mariupol, where more than 80 adults and children, including Turkish citizens, have taken refuge, Ukraine's foreign ministry said on Saturday.

Ukraine has accused Russia of refusing to allow people out of Mariupol, where a blockade has left hundreds of thousands trapped. Russia blames Ukraine for the failure to evacuate people.

"The mosque of Sultan Suleiman the Magnificent and his wife Roxolana (Hurrem Sultan) in Mariupol was shelled by Russian invaders," the foreign ministry said in a tweet. "More than 80 adults and children are hiding there from the shelling, including citizens of Turkey.

It did not say if there were any people killed or wounded. Moscow has denied targeting civilian areas in what it calls a special military operation in Ukraine.