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* Former FBI director to testify before Congress on Thursday
* UK election outcome, ECB meeting also on same day
* Oil falls further below $50 as Mideast rift weighs
* Dow down 0.12 pct, S&P off 0.12 pct, Nasdaq up 0.08 pct (Adds details, changes comment, updates prices)
By Tanya Agrawal
June 6 (Reuters) - U.S. stocks edged lower in late morning trading on Tuesday as investors shunned riskier assets ahead of what is expected to be a busy Thursday, when Britain goes to the polls and former FBI director James Comey testifies before Congress.
Comey, who was investigating a possible collusion between Donald Trump's presidential campaign and Russia to sway the 2016 U.S. election, was fired in May.
His testimony could dampen already flagging momentum for Trump's legislative agenda of rolling back healthcare reforms and overhauling the tax code.
Investors will also watch out for the European Central Bank's meet, where policymakers are expected to take a more benign view of the economy, according to sources.
"We have a relatively light week in terms of economic data and investors are awaiting Thursday's events," said Randy Frederick, vice president of trading and derivatives for Charles Schwab in Austin, Texas.
"The market's reaction to Comey's testimony would depend on if he says something new that nobody knows about, although, a lot of what he might be asked could be classified information."
Safe havens were in favor, with gold touching its highest in about seven weeks and U.S. 10-year Treasury yields falling to their lowest levels since the days following the November election.
At 10:45 a.m. ET (1445 GMT), the Dow Jones Industrial Average was down 24.8 points, or 0.12 percent, at 21,159.24 and the S&P 500 was down 3.04 points, or 0.12 percent, at 2,433.06.
The Nasdaq Composite was up 4.74 points, or 0.08 percent, at 6,300.42.
Eight of the 11 major S&P 500 sectors were lower, with the financial index's 0.35 percent fall leading the decliners as a fall in bond yields weighed.
Oil prices fell further below $50 a barrel on concerns that a diplomatic rift between Qatar and several Arab states, including Saudi Arabia, could undermine efforts by OPEC to tighten the market.
Shares of HD Supply Holdings plunged 19 percent to a near seven-month low of $33.41 after the industrial distributor said it would sell a unit to private equity firm for $2.5 billion. The stock was the biggest drag on the Nasdaq.
Wal-Mart Stores fell 1.5 percent to $79.08, dragging down the Dow, after Amazon.com said it would offer Prime subscription service at a discount to its U.S. customers on government aid, taking aim at a key customer base of the discount retailer. Amazon was up 0.2 percent.
Michaels Cos fell as much as 9 percent to a three-year low of $18.05 after the crafts and home decor retailer slashed its forecast.
Declining issues outnumbered advancers on the NYSE by 1,770 to 958. On the Nasdaq, 1,632 issues fell and 994 advanced.
The S&P 500 index showed 28 new 52-week highs and 11 new lows, while the Nasdaq recorded 82 new highs and 70 new lows. (Reporting by Tanya Agrawal in Bengaluru; Editing by Anil D'Silva)