Igor Malicki of Ukraine, a survivor of the former German Nazi concentration and extermination camp Auschwitz visits the camp in Oswiecim on 26 January 2015.Reuters 
Visitors walk inside the former German Nazi concentration and extermination camp Auschwitz in Oswiecim.Reuters 
Visitors walk inside the former German Nazi concentration and extermination camp Auschwitz in Oswiecim.Reuters 
Visitors walk through a museum in the former Nazi German concentration and extermination camp Auschwitz in Oswiecim.Reuters 
Pictures of prisoners who died are displayed on the wall inside at the former German Nazi concentration and extermination camp Auschwitz in Oswiecim.Reuters 
Members of Polish Scouting Association from Canada and U.K. stand in front of the block 15 in the former Nazi German concentration and extermination camp Auschwitz in Oswiecim.Reuters 
A guard tower is seen at the former German Nazi concentration and extermination camp Auschwitz-Birkenau near Oswiecim.Reuters
Thousands of people across Britain gathered to honour and remember the Holocaust victims and mark the 70th anniversary of the liberation of Auschwitz-Birkenau, which was a network of German Nazi concentration camps on Tuesday, 27 January.
Some survivors of the mass genocide also participated in the event.
Joachim Gauck, Angela Merkel, Andreas Vosskuhle, François Hollande and several other politicians, dignitaries and religious leaders joined the survivors during the commemoration ceremony in central London and in Oswiecim, Poland on Tuesday.
Holocaust Memorial Day Trust (HMDT) also hosted an event in central London. Reports suggest that nearly 2,400 events are planned across the continent to remember the victims of the deadly attack.
A Holy Mass has also been arranged at the Centre for Dialogue and Prayer to pay respect to the survivors as well as the dead ones.
More than 300 survivors laid wreaths to pay tribute to almost six million Jews, who were killed by the Nazi regime 70 years ago.
