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* TSX ends down 0.28 percent at 11,824.43
* Euro zone debt fears help trigger heavy selling
* Oils, financials lead index lower (Updates to close)
By Jennifer Kwan and Ka Yan Ng
TORONTO, May 6 (Reuters) - Toronto's main stock index closed lower on Thursday, but cut a near-4 percent intraday tumble, sparked by a drop in crude futures and worries the Greek debt crisis may widen to other euro zone countries.
The TSX energy sector tumbled 1.41 percent, though losses were four times bigger at one point, as U.S. crude prices fell below $77 a barrel on fears the debt crisis could threaten economic recovery and undercut demand for oil. [O/R]
EnCana Corp (ECA.TO) fell 1.39 percent to C$31.95 and Nexen NXY.TO dropped 2.88 percent to C$22.97.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE finished down 32.70 points, or 0.28 percent, at 11,842.43.
Amid the selloff, the TSX fell 452 points, or 3.8 percent, to 11,422,73, its lowest level since Feb. 25.
By the end of the session, six of the index's 10 main groups had bounced back. But lower energy and financials, two of the most influential sectors, underscored lingering worries over wider contagion from Greece's debt crisis.
Thursday afternoon's rapid slide by the TSX echoed an even sharper plunge by U.S. stocks, with Nasdaq down more than 9 percent at one point. [.N] [MKTS/GLOB]
Along with the Greek debt crisis, analysts also cited uncertain U.K. elections and a large, erroneous trade entered by a a big Wall Street bank as possible reasons behind the session's volatility. [ID:nN06234011]
"Some or all of it could have contributed to this." said Ian Nakamoto, director of research at MacDougall, MacDougall & MacTier. "It's a confluence of anxiety."
$1=$1.05 Canadian Reporting by Ka Yan Ng; editing by Rob Wilson