Two-thirds of the Jewish victims of the Nazis have now been identified.
Since the Holocaust ended, there has been an ongoing effort to identify the six million Jews and millions more non-Jewish people slaughtered by the Nazis.
But 65 years on, there are still two million whose identities are not known.
Although the Nazis kept meticulous records during the Holocaust, many documents were destroyed during the war and whole families were wiped out.
Yad Vashem, Israel’s Holocaust museum is dedicated to finding the names of as many as possible.
The museum said this week that an online database containing the names of victims now includes the records of four million people – one million more than when it was launched in 2004.