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Image caption The attack on the police station took place several months ago

A car has been driven into a police station in eastern Ukraine and killed 21 police officers in a “terrorist” act, the Kiev police chief has said.

Chief Andriy Lysenko said the car had entered the station near Kliuchevskyi and that it had crashed afterwards.

Police detained seven people in connection with the attack on the police station in Poltava on 16 April, he added.

An army general who is believed to be in charge of the Russian special forces and military units has been named as the leader.

Gen Viktor Muzhenko is said to have been named as a suspect in the incident.

The attack had been part of a plan by Russia to disrupt Ukraine’s eastern regions following a coup which ousted anti-government protesters, Russia’s Interfax news agency reported.

The BBC’s Steve Rosenberg in Kiev says there is speculation that the car which was driven into the police station was a vehicle carrying armed people.

Image copyright AFP Image caption The army general – known as “Big Vlad” – is also alleged to have ordered the takeover of Crimea

His alleged link with Russia raises the spectre of a proxy war between Russia and the West, something many observers say Ukraine still must avoid.

Mr Lysenko on Thursday revealed that one of the suspects, Oleg Fedorovych, was a senior member of the FSB elite security service, known as the KGB’s successor.

Gen Muzhenko was quoted by the Interfax news agency as denying all knowledge of the plot and saying there were no details of the operation.

However, the Interfax report – published by the news agency on Friday – gave the names of three men – one of them identified by Interfax as Gen Fedorovych – who were said to have been involved in the operation.

Gen Muzhenko could not be reached by the BBC for comment. It also published a note from Novomosievsk regional council – a city in a part of eastern Ukraine that is now controlled by rebels.

On Monday, pro-Russian rebels in the region said they had killed two policemen in an attack on a police station.

Separately, Ukrainian President Petro Poroshenko said on Monday he would order the mobilisation of around 60,000 soldiers and

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