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* Dollar sinks below 110 yen for first time in six weeks
* Three significant "risk events" due on Thursday
* Graphic: World FX rates in 2017 tmsnrt.rs/2egbfVh (Updates with U.S. market open, changes dateline; previous LONDON)
By Saqib Iqbal Ahmed
NEW YORK, June 6 (Reuters) - The dollar fell to a more than six-week low against the yen on Tuesday, dipping below a key technical level as treasury yields slipped on heightened caution ahead of a trio of events on Thursday.
U.S. Treasury yields fell as investors piled into low-risk bonds on worries linked to Britain's general election, the European Central Bank's policy meeting and former FBI Director James Comey's testimony before a Senate panel, all scheduled for Thursday.
The dollar was down 0.91 percent against the yen at 109.45, having broken below its 200-day moving average to touch 109.29 yen, its lowest since April 21.
"It's safe-haven (demand) as well as the technical break that's driving dollar-yen," said Brad Bechtel, managing director FX at Jefferies in New York.
"It's basically following yields in the U.S., which are grinding lower as the market gets a little bit nervous ahead of Thursday."
With the Bank of Japan keeping 10-year Japanese bond yields pinned to zero, the dollar-yen exchange rate has been closely correlated for the past year with any shifts in U.S. 10-year Treasuries.
The dollar index, which tracks the greenback against six major rivals, was down 0.18 percent at 96.624.
Comey, fired by President Donald Trump in May, will be grilled by the Senate Intelligence Committee on whether Trump tried to get him to back off an investigation of alleged ties between his 2016 campaign and Russia.
The threats to Trump and some of his senior advisers from the affair have added to market doubts over the administration's ability to deliver a promised boost to growth and weighed on the dollar.
The euro was up 0.16 percent against the dollar to $1.127. The common currency has gained in recent weeks on various factors, including an ebb in French political concerns and upbeat euro zone data.
However, complacency that the ECB will be less dovish has left the euro vulnerable to disappointment if the central bank does not satisfy those expectations, analysts said.
Sterling was down 0.09 percent against the dollar to $1.2889. With two days to go until Britain holds a national election, opinion polls have shown that Prime Minister Theresa May's lead over the opposition Labor party has ebbed over the last three weeks, with some putting her majority in doubt.
"This has put sterling under pressure as investors are looking to cover their risk," said Naeem Aslam, chief market analyst for Think Markets in London.
Reporting by Saqib Ahmed; Editing by Dan Grebler