LONDON (NEWSnet/AP) — Britain imposed sanctions Wednesday on six top officials at the penal colony where Russia opposition leader Alexei Navalny died last week.

U.K. says the officials were responsible for  brutal treatment Navalny suffered in the final months of his life.

The six officials, targeted under U.K. human rights laws, include Col. Vadim Konstantinovich Kalinin, who oversees the prison camp where Navalny was held in solitary confinement for up to two weeks at a time.

Navalny also was denied medical treatment and forced to walk outdoors in temperatures dropping to below freezing, the claim says.

“It’s clear that the Russian authorities saw Navalny as a threat and they tried repeatedly to silence him, Foreign Secretary David Cameron said.

The six prison officials will be barred from traveling to Britain, and any assets they may have in the country will be frozen.

Britain also urged Russia authorities to release Navalny’s body to his family.

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