World biggest nuclear bomb

The blast that devastated large parts of Beirut in August was one of the biggest non-nuclear explosions in history, experts say.

The Sheffield University, UK, team says a best estimate for the yield is 500 tons of TNT equivalent, with a reasonable upper limit of 1.1 kilotons.

This puts it at around one-twentieth of the size of the atomic bomb dropped on Hiroshima, Japan, in 1945.

The team mapped how the shock wave propagated through the city.