Engineers from Newcastle have been developing blast-resilient train carriages to minimise the impact that a terror attack might have to the public and emergency services.
Preventing flying objects is the key.
Tethering ceiling panels reduced the risk of fatalities and injury from flying shrapnel and also meant the gangways were kept relatively clear of debris, allowing emergency staff quick access to the injured.
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Ten people have died on the mountain so far this climbing season - four more than mountaineering officials expect in a typical year.
“We can use peace”, the US President told the pontiff in their first face-to-face meeting on Wednesday.
A man with a knife has been arrested near Buckingham Palace in an incident Scotland Yard said was not believed to be terror related.