Politically minded hackers attacked the website of an organization run by former Soviet premier Mikhail Gorbachev last week, accusing him of the massacre of 130 people in 1990.

The hackers displayed photographs of a suppressed pro-independence demonstration in former Soviet Azerbaijan and posted an open letter to the one-time Soviet leader, according to a report by the Associated Press.

The site was offline by Saturday afternoon, but it was unclear whether hackers or the site’s administrators were responsible.

Protests broke out against Armenians in Baku, the Azerbaijani capital, in January 1990 over the disputed territory of Nagorno-Karabakh. Soviet troops intervened and put down the protests in week-long clashes.

International human rights groups said the force used against demonstrators was excessive, according to the AP.

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