Japan may have spent $32bn in Friday's yen intervention

The second day of buying came on top of the U.S. selling euros for yen

Around 6 p.m. on July 31 in Japan, the yen surged to the 158 range against the dollar from about 160 earlier. (Photo by Mayumi Tsumita)

TOKYO -- Preliminary money market data released by the Bank of Japan suggests that Japan on Friday spent around 31.8 billion dollars buying yen, part of a two-country intervention in which U.S. authorities also participated by trading euros for yen.