Olivia Marks-Woldman, chief executive of the Holocaust Memorial Day Trust, said:
We are deeply concerned by the lack of understanding among the population as a whole, and in particular the younger generations.
This research shows our work is more important than ever.
Genocide is not something that takes place by itself - it happens when a set of circumstances occur or are created, when racism and discrimination go unchecked and are allowed to divide communities.
A lot has been achieved, but there's plenty still to do to ensure that history does not repeat itself.
More top news
"We are not afraid." Those were the defiant words of the Prime Minister this morning as she addressed the Commons.
Andreea Cristea, 29, remains in a critical condition after being rescued from the Thames after a terror attack along Westminster Bridge.
The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.