TOKYO, Oct 9 - A senior Finance Ministry official said on Thursday that Japanese authorities would take action in the foreign exchange market if necessary and that recent movements in rates had been too rapid. "Movements have been rapid and we are watching the market with interest," Hiroshi Watanabe, head of the ministry's international bureau, told reporters. "We will do what is needed," he said. He added that there was no set agenda for what Japanese Prime Minister Junichiro Koizumi would discuss with U.S. President George W. Bush next week, but that forex, even if discussed, would not be a top priority. Bush arrives in Japan on October 17 for an overnight stay. Japanese authorities spent a record 13.5 trillion yen on intervention in the first nine months of this year to stem the yen's rise.//