Inside the imposing sand coloured and fortress-like walls of the Saudi Ministry of Foreign Affairs in Riyadh there is a perhaps justifiable sense of pique. The ministry previously

The officials said Riyadh warned the German authorities the suspected attacker, Taleb al-Abdulmohsen, a Saudi dissident who described himself as an ex-Muslim, had boasted on social media that “something big will happen in Germany”. It was unclear if police ever acted upon the warnings.