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Flags around the world - in France, Canada, US, New Zealand, the UK, and others - will be flown at half-mast.
Mr Osborne also said growth forecasts for next year had been revised from 1.8 per cent to 2.5 per cent.
At least 20 soldiers have been killed and dozens wounded in the latest violence in the capital Sanaa.
Chinese authorities have been aggressively trying to tackle the problem of poor air quality in some of their major cities.
A common monetary unit will not be implemented until local currencies are phased out, and an integrated central bank is set up.
The inspection of Arak will be the first step toward meeting the tenets of the interim agreement reached by Iran and world powers in Geneva last week.
The currency markets in Brazil, Argentina, Chile and others registered consecutive devaluation this week.
There have been reports that the NSA has been tapping into fibre-optic cables between data centres.
On Monday, stocks jumped 0.5 per cent in Seoul's Kospi, and in Japan, the Nikkei rose 1.5 per cent to a six-month high.
Authorities issued the highest alert for volcanic activity as it warned of increased eruptions of Mount Sinabung in north Sumatra.
