A Bosnian Serb war criminal has been brought to Poland to serve out his sentence after he was assaulted in a British prison, a justice official said on Friday.

Former general Radislav Krstic was convicted in 2001 and handed a 35-year prison sentence by the U.N. tribunal for the former Yugoslavia in The Hague, Netherlands, for aiding and abetting genocide over the 1995 killing of some 8,000 Muslims in Srebrenica, Bosnia.

Bartlomiej Turbiarz, a spokesman for the local prison service, said that Krstic was brought to a specially guarded prison in Piotrkow Trybunalski, in central Poland, on Thursday and was placed in a one-person cell that is monitored around the clock.

A Warsaw court has two months to rule how much longer, according to Poland’s law, Krstic should serve, spokeswoman for the Justice Ministry, Patrycja Loose said. Poland’s maximum prison term is 25 years.

Poland agreed to hold Krstic after he was attacked and injured by three Muslim inmates in Wakefield Prison, in northern England, in 2010.

Poland hasn’t held a foreign war criminal since Nazi official Erich Koch, who died in Barczewo prison in 1986.

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