Several leading Russian cultural figures and activists have called on authorities to release the body of opposition leader Alexei Navalny, who died in an Arctic prison colony last Friday.

After days of being denied access, Navalny’s mother Lyudmila said Thursday she had finally been allowed to see her dead son’s body, but that authorities were not willing to give her custody and wanted to bury him secretly.

More than 25 film makers, artists, Nobel Prize winners and opponents of President Vladimir Putin have so far called for his body to be released, in videos published by his team on social media.

They include Nobel Prize winning editor Dmitry Muratov, protest rock band Pussy Riot member and activist Nadezhda Tolokonnikova, writer Victor Shenderovich and movie director Andrey Zvyagintsev.

“It’s awkward to talk about this in a country that considers itself to still be Christian. Just give Lyudmila Ivanovna her son… without any conditions,” Mr. Muratov said.

He said authorities were trying to keep Navalny in solitary confinement even in death, as they had done for long stints of his three years in prison.