Jeremy Corbyn, the Labour leader, has visited the site of a former concentration camp during a trip to Europe.
Mr Corbyn posted images of himself at Theresienstadt, in the Czech Republic, alongside the message: “Never forget.”
He toured the Nazi camp on Saturday.
Yesterday, I visited Terezin Memorial - a World War II concentration camp and former Jewish ghetto.— Jeremy Corbyn MP (@jeremycorbyn) December 4, 2016
Never forget pic.twitter.com/AkWbBQj3L5
Mr Corbyn had earlier travelled to Prague to address leaders of left-wing parties from the continent.
A parliamentary committee criticised the MP in October, saying he did not fully appreciate “the distinct nature of contemporary antisemitism”, and suggesting it was possible his party was “institutionally antisemitic”.
Speaking to the Independent before the visit, Mr Corbyn said: “The Terezin memorial is a vital reminder of the genocidal crimes carried out during the Second World War and the dangers that far-right politics, antisemitism and racist scapegoating pose to society.
“The stories of the families incarcerated here are deeply moving and sobering. Many died of starvation and malnutrition, the cruelty and inhumanity of their treatment was unspeakable.
“We must never forget the horrific crimes perpetrated by the racist, far-right Nazi regime in Europe and the justice of the struggle waged by the Allied forces and the anti-fascist resistance against it.
“It is an obligation for all of us to work together to build a world of respect, tolerance and peace.”