Arnolds is touring Europe in support of Variations of Static, and will later open for his fellow Icelanders in Sigur Ros.

NPR: Olafur Arnalds: 'Vid Vorum Sma'

Speaking later in the House of Commons, Mr Hague expressed concerns that international humanitarian efforts in Syria were under-resourced and said the amount of support the UK was giving to opposition groups could not remain "static in the face of this growing calamity".

BBC: Syrians flee fighting in the city of Aleppo