Oskar Groening trial: 'I saw him and I felt pity'

Auschwitz survivors from the UK have been giving evidence in the trial of a former Nazi guard at the death camp.

Oskar Groening is accused of helping to murder more than 300,000 people.

Among those who arrived at Auschwitz in 1944 was a 12-year-old Jewish boy from Hungary. Ivor Perl spoke to the BBC's Jenny Hill about surviving Auschwitz and about facing his former guard.