By Matt Prodger BBC correspondent in Belgrade

Srebrenica was the worst massacre of civilians in Europe since WWII

Ljubisa Beara was indicted more than two years ago in connection with the 1995 Srebrenica massacre.

He was the head of security for the Bosnian Serb army and responsible for prisoners of war at the time.

More than 7,500 Muslim men and boys from Srebrenica were killed in the most infamous crime of the Balkan wars.

In March 2002 The Hague tribunal indicted Mr Beara on charges of genocide or complicity to commit genocide.

Prosecutors say he was directly responsible for killing Muslim prisoners and forcibly expelling thousands of women and children from Srebrenica.

Ljubisa Beara surrendered to the Serbian authorities on Saturday in order to protect state interests and his family Serbia and Montenegro government

He is also accused of being part of what the tribunal calls a joint criminal enterprise with, among others, the head of the Bosnian Serb army, General Ratko Mladic - who is still at large.

According to the government of Serbia and Montenegro, Mr Beara said he was giving himself up to protect the interests of the state and those of his family.

In previous extradition cases suspects have been put under intense pressure to surrender rather than be arrested, which is viewed by the authorities as a politically unpopular approach.

Some 15 suspects believed to be in Serbia and Montenegro are wanted by international prosecutors.