SARAJEVO (AFP) -- A mass grave containing the remains of Serb victims of Croatia's World War II fascist Ustasha regime has been discovered in Bosnia, 65 years after they were massacred, an official said Thursday.

Uncovered from the burial site near the northwestern town of Novi Grad were the remains of 35 women and children and an elderly man, Milan Ivancevic of the Bosnian Serb commission for missing persons told AFP.

"The identity of the victims is already known because of the existence of photos presenting these women and children as having been slaughtered by Ustasha with knives" in 1941, said Ivancevic.

The remains would be reburied later this month at the request of the families, he added.

During World War II, hundreds of thousands of Serbs, Roma and anti-fascist Croatians were killed in concentration camps under Croatia's pro-Nazi Ustasha regime.

Meanwhile, the Simon Wiesenthal Centre, which estimates that some 600,000 people were murdered in Croatia's notorious Jasenovac camp, has urged Serbia to seek the extradition for the WWII crimes of two Croatians still at large.