The Swedish government has launched an online database with more than 1,000 documents on the disappearance of Raoul Wallenberg, a diplomat who saved thousands of Jews from Nazi death camps.

The searchable database collects previously published material in one place to make it easier for both government and private researchers to explore Wallenberg's case, said Harald Hamrin, a retired Swedish diplomat who led the initiative.

Wallenberg, who worked as a diplomat in Budapest, is credited for having saved at least 20,000 lives during World War II. He was arrested by Soviet troops in 1945 and is believed to have died in captivity, although the time and circumstances of his death remain unclear.