Nine people, including six police officers, have been arrested by Serbian authorities in connection with the deaths of 48 Kosovo Albanians in 1999.
Victims are believed to have been trucked to Serbia
They are accused of killing 48 people, including children, babies and a 100-year-old woman in Suva Reka.
These are the first arrests linked to the 2001 discovery of mass graves containing the remains of more than 800 victims of the Kosovo war.
The 48 were found in graves at Batajnica, near Belgrade.
Autopsies showed they had been executed. The remains were later returned to families in Kosovo.
Suva Reka is on the main road south of the Kosovo capital, Pristina, which was a focus of fighting in the 1998-1999 war between Serbia and the Kosovo Liberation Army.
Suva Reka is mentioned in the UN war crimes tribunal's indictment of former Yugoslav President Slobodan Milosevic and four of his senior officials, issued in May 1999.
Some 10,000 people died during the Kosovo war - most of them ethnic Albanians. More than 3,000 are still missing.
The authorities in Belgrade have been criticised for being slow to return the bodies discovered in mass graves in Serbia proper.
Many of the killings are thought to have taken place in Kosovo before the bodies were driven in lorries to locations around Serbia.