18 September 2013 Last updated at 09:33 ET

French carrier Air France has said it plans to cut a further 2,800 jobs through voluntary redundancy as it struggles to cut costs.
The airline, part of the Air France KLM group, had already announced plans to cut 5,100 jobs from its 69,000-strong workforce as part of a turnaround plan.
But it has now admitted it will miss its financial targets for 2013.
Air France said it was in negotiations with unions regarding the latest planned cuts.
The airline merged with Dutch carrier KLM in 2004.
Source: BBC News - Business http://www.bbc.co.uk/news/business-24143392#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

