A fugitive Nazi war criminal who helped send 15,700 Jews to their deaths has been tracked down in Budapest by a British tabloid newspaper.

The Sun newspaper on Sunday reported that it had found 97-year-old Ladislaus Csizsik-Csatary with the help of information supplied by the Simon Wiesenthal Center in Israel.

Csizsik-Csatary had been Number One on the Center’s “Most Wanted” list of Nazi criminals. He “played a key role in the deportation of over 15,000 Jews to Auschwitz in the spring of 1944 and of hundreds of Jews to Kamenetz-Podolsk in the Ukraine, where almost all were murdered, in the summer of 1941,” said Nazi hunter Efraim Zuroff, director of the Wiesenthal Center’s Israel office.

Sun reporters Brian Flynn and Ryan Parry wrote that they found him living in a two-bedroom apartment in a “smart district” of the Hungarian capital. The Sun published photographs of Csizsik-Csatary at his apartment door and walking in the street. His whereabouts, it said, had been a mystery for 15 years.

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Csizsik-Csatary had been a police commander in charge of the Jewish ghetto in Kassa, Hungary – now Kosice, Slovakia — during World War II. According to documentation provided by the Wiesenthal Center, he forced Jews to “dig ditches in frozen ground with their bare hands, made dissenting Jews take up stress positions for hours, hit them with a dog lead and oversaw a shoot-on-sight policy if they tried to escape.”

Csizsik-Csatary fled to Canada after World War II and assumed a new identity. He was sentenced to death for war crimes in absentia in Czechoslovakia in 1948.

The Sun reported that he fled Canada in 1997 after his identity was discovered and Canadian authorities stripped him of his citizenship. Canadian authorities quoted by the Sun said he had been a “commander” in the Royal Hungarian Police in Kassa in charge of officers who guarded the ghetto. “He supervised the drawing-up of lists of its inhabitants, conducted personal searches of Jews and confiscated valuables,” the Sun reported.

The police transferred about 12,000 Jews from the ghetto in Kosice to a brickyard at the end of April 1944 and deported them to Auschwitz and other Nazi camps. Only about 450 survived.

“Last week I submitted new evidence to the prosecutor handling the case and we are pushing as hard as possible to get him on trial,” Zuroff said Sunday in a Facebook post.