Former Bosnian Serb army chief Ratko Mladic, on trial for war crimes in The Hague, is being treated for what doctors suspect is pneumonia.

A spokeswoman for the Hague-based international war crimes tribunal confirmed Tuesday the 69-year-old Mladic was given medical treatment in a hospital but would give no further details, citing patient confidentiality. She said he had been transferred to the custody of the tribunal with a series of pre-existing health conditions.

Mladic is on trial for genocide and war crimes in the 1992-to-1995 war in Bosnia-Herzegovina. He has been accused of crimes against humanity, including planning the death of 8,000 Muslim men and boys over a six-day period in 1995.

Authorities located Mladic in May and extradited him to The Hague after 16 years on the run.