The Kremlin on Tuesday refused to reveal any details about casualties suffered from the sinking of Russia’s guided-missile cruiser Moskva, as parents called for the truth about their missing children.

News agency AFP reported that the flagship of Russia’s Black Sea Fleet sank last week after an explosion and fire that Ukraine said was caused by a successful missile strike and Russia said was the result of exploding munitions.

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The Russian authorities reportedly said the crew had been evacuated from the warship — which is able to carry up to 680 sailors — but gave no other details.

After the Moskva sank, parents and other family members of sailors who served aboard took to social media, saying their children had gone missing and that they needed answers.

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On Tuesday, Russian President Vladimir Putin’s spokesman said the Kremlin was not at liberty to reveal any details.

“All communication is only through the defence ministry,” spokesman Dmitry Peskov said. “All information regarding this is issued by the defence ministry and here we are not authorised to release anything.”

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Several families have said on social media or in statements to independent Russian or foreign press that they cannot find their children who were serving on the Moskva.

Dmitry Shkrebets said that his conscript son Yegor was a cook on the ship and was now listed as missing in action.

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Around 100 men were wounded while the precise number of missing is unknown, the publication said.

Some 500 people were on board when the Moskva was hit, Meduza said, citing several reports.