Amnesty International, a campaign group which has accused the Kremlin of violating human rights with its bombing campaign in Syria, was evicted from its Moscow office today.

The Moscow city government, from which Amnesty leased the premises in the Russian capital’s centre, said the group was behind on the rent, but Amnesty said it had documents to prove it was up to date with payments.

Staff at the Moscow office told Reuters they arrived at work to find the locks had been changed, official seals had been placed over the doors and the electricity had been cut off.

John Dalhuisen, Amnesty International’s Europe director, said the eviction may be part of an official crackdown on civil society groups that criticise the Kremlin, but he said there were other possible explanations too.

In a statement, the Moscow city property department said it had sent written warnings to Amnesty that it was in rent arrears.

“This complaint was ignored by the unscrupulous tenant,” the statement said. The department said it voided Amnesty’s lease on the grounds that the tenant was violating the terms of the rental agreement.

“In this connection, the premises were closed and sealed off,” the statement said.

Amnesty’s Dalhuisen said: “This bizarre claim is simply not true.” He said the group received no warning and had documents showing the property was paid for up to and including October.

“As an organisation, along with others, that has criticised the Russian authorities, it is possible this fits into the context of the squeeze on civil society,” he said in a telephone interview.

“It is equally possible however that this is a genuine administrative mix-up, or that other interests are at play within the municipality. At this stage I do not want to speculate until we have had the opportunity to try to resolve this with the municipal authorities.”

Kremlin spokesman Dmitry Peskov said he was unaware of Amnesty’s office problems.