Fears grow over Greek debt crisis

Financial markets across the world have continued to experience serious volatility amid a worsening debt crisis in Europe sparked by the downgrading of Greece’s massive debt to junk status.

Athens has asked the European Union and IMF for more than $50bn to help bail the country out of its economic problems.  

Many analysts fear the crisis could trigger the downfall of other vulnerable economies in the eurozone.

Jonah Hull reports.