The Nazi-hunting Simon Wiesenthal Centre said on Sunday (local time) it has provided "new evidence" to authorities in Budapest on its most wanted suspect Laszlo Csatary, who is believed to be living in Hungary.
The centre's Efraim Zuroff "last week submitted new evidence to the prosecutor in Budapest regarding crimes committed during World War II by its No 1 Most Wanted suspect Laszlo Csatary," accused of complicity in the deaths of 15,700 Jews, it said.
"This new evidence strengthens the already very strong case against Csatary and reinforces our insistence that he be held accountable for his crimes," Zuroff said in the statement.
The centre said the evidence "related to Csatarys key role in the deportation of approximately 300 Jews from Kosice to Kamenetz-Podolsk, Ukraine, where almost all were murdered in the summer of 1941."
The Wiesenthal Centre urged Hungarian prosecutors to put Csatary, 97, on trial, charging he had served during World War II as a senior Hungarian police officer in the Slovakian city of Kosice, then under Hungarian rule.
"This new evidence strengthens the already very strong case against Csatary and reinforces our insistence that he be held accountable for his crimes," said the centre.
"The passage of time in no way diminishes his guilt and old age should not afford protection for Holocaust perpetrators."
"Zuroff urged Hungarian authorities to expedite the ongoing investigation against Csatary, which was initiated in September 2011 following his submission of evidence regarding Csatarys residence in Budapest and the former police officers role in the deportations of thousands of Jews from Kosice and its environs to the Auschwitz death camp in the spring of 1944."
The centre said Csatary had been photographed and filmed in Budapest last September.
He was located after a tip-off, for which the informant will be paid $25,000 "if the Nazi criminal is convicted and sentenced," Zuroff told AFP.
Hungary's assistant prosecutor general, Jeno Varga, said: "An investigation is under way. The prosecutor's office will study the information received."