Japan's central bank is believed to have intervened for the second time in a week to combat the rising yen.
The FTSE 100 opened lower this morning, down 0.31% to 5,529, as miners saw falls across the board.
The manager of Jupiter's Japan Income fund says Japan's move yesterday to weaken the yen was welcome, but not enough to make investors truly positive on the country.
The yen is higher against major currencies today despite the Japanese Government unveiling a ¥920bn stimulus package and the BoJ extending an additional ¥10trn of lending to banks.
Henderson chief economist Simon Ward believes the yen, rather than the US dollar, could be the big winner from a loss of confidence in the euro.