In other news
The euro has fallen after Europe gave Greece a deadline to submit fresh bailout reform proposals or face a eurozone exit, and Chinese stock market rout spooked traders.
US stocks have finished higher in a topsy-turvy session, rallying after worries about Greece and China caused deep losses in early trade.
Asian markets have tumbled after Greece was slapped with a deadline to submit fresh bailout reform proposals or face a eurozone exit, Shanghai and Hong Kong dipped as Chinese collapse.
Oil prices have fallen in Asia on Greece's uncertain future in the eurozone after being hit with a bailout reform ultimatum, and Chinese equities' bloodbath affects other markets.
The European Central Bank cannot provide emergency funding to banks on overly generous terms or against insufficient collateral spelling out strict terms for banks.
The Greek economy may face more trouble after voters have delivered a defiant no to the terms of a bailout, but tourists remain undeterred.
Oil prices have fallen back, reversing earlier gains as traders fretted over global demand worries arising from the Chinese stock market rout.
Europe's main markets closed lower Tuesday, with London's benchmark FTSE 100 index of top companies losing 1.58% to 6 432.21 points.