When asked why the British embassy had not been withdrawn, Mr Hague said that he did not rule it out given the "gravity of the situation" but that "our embassy is not involved in killing people".

BBC: Hague: 'Deeply frustrating' situation in Syria

Google, which owns YouTube, said in a statement that the video was "clearly within our guidelines and so will stay on YouTube", but added that "given the very difficult situation in Libya and Egypt" it had restricted access to the video in both countries.

BBC: Q&A: Anti-Islam film

Given the severity of the situation and the extensive supply constraints caused by the disruptions, including those described by our primary competitor, the effects on our industry are likely to be substantial and extend over multiple quarters.

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