A sign for the Bank of Greece in Athens
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Business Bites: Greek crisis batters European shares

European shares have slid into the red as the continuing political uncertainty in Greece undermines investor confidence.

There are concerns about the prospect of Greece leaving the eurozone, with European central bankers now talking more openly about what the future could hold for the euro currency region.

Santander - the biggest eurozone bank by market value - slumped almost 4%, and London's 100 share index fell 1.7%.

Meanwhile, Yahoo has announced its Chief Executive Scott Thompson is stepping down after a controversy over a fake computer science college degree on his CV.

The BBC's Aaron Heslehurst discusses the key financial stories of the day.