VIDEO: This poignant animation cartoon is a 14-year-old girl's memory of Hiroshima

Today marks 70 years since the bombing of Hiroshima, the first time nuclear weapons were ever used on a civilian population.

The occasion is being commemorated in Japan, where the average age of survivors is over 80 years - making the preservation of their memories an important task.

Among the tributes, historical timelines, and eyewitness account published this week is a short animation from the BBC, in which an elderly Japanese poet recounts seeing the bomb explode over the city when she was just 14 years old.