New details have emerged about the air crash on 27 March 1968 that killed Yuri Gagarin - the first man in space.

Fellow cosmonaut Alexey Leonov claims an "unauthorised" plane flew too close to Gagarin's fighter jet, sending it into a spin.

Gagarin and his flight instructor Vladimir Seryogin died when their MiG-15 went down near the town of Novoselovo, about 90km from Moscow.

Secrecy surrounding the crash has led to vigorous speculation down the years....