“They were very impressed by their visit,” said an Anne Frank House spokesperson.
Gillian Walnes, executive director of the Anne Frank Trust UK, said the visit “sends a very positive message to young fans.
"It invites their curiosity about knowing more – reading Anne’s diary, or even visiting the Anne Frank House.
"When Justin Bieber visited last year, and caused such a media furore, it actually resulted in thousands of young people wanting to know more about Anne Frank and her story.“