* FTSEurofirst 300 down 0.8 pct, reversing Tuesday's rally
* Energy shares fall on worries over U.S. oil demand
* Miners sag; BHP drops after going hostile in Potash bid
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By Blaise Robinson
PARIS, Aug 18 (Reuters) - European stocks sagged in early trade on Wednesday, with a key index failing to stay above a resistance level pierced in the previous day, as heavyweight oil shares fell along with oil prices on worries over U.S. demand.
At 0802 GMT, the FTSEurofirst 300 <
> index of top European shares was down 0.8 percent at 1,047.98 points, while the Euro STOXX 50 < > was down 0.8 percent at 2,714.68 points, retreating from the 50 percent Fibonacci retracement of a drop from an April high to a May low tested on Tuesday."The market is still range-bound. Earlier this month, we tested the upper limit of the range, and now the indexes are poised to revisit the lower limit of the range," said Alexandre Le Drogoff, technical analyst at Aurel BGC in Paris.
"There is no conviction at the moment and this will go on until September when investors come back from holiday," he said.
The Euro STOXX 50, which has been confined to a range since late April, was falling towards its 50-day moving average at 2,696.97 points, seen as the index's next big support level.
Energy shares fell as oil futures <CLc1> drifted lower to $75.15 a barrel, not far from a one-month low touched earlier this week, dragged by concerns over demand in the United States.
Total <TOTF.PA> was down 1.3 percent, Royal Dutch Shell <RDSa.L> down 0.7 percent and Repsol <REP.MC> down 1.2 percent.
BP <BP.L> shed 1.4 percent. After hitting a bottom in late June, the stock strongly recovered as the company made progress in plugging the leaking well in the Gulf of Mexico, but it has been retreating over the past two weeks on mounting concerns over legal risks related to the clean-up of the leak.
MINERS DOWN
On Tuesday, two scientific reports raised fresh worries over the environmental impact from oil spill and questioned government assurances that most of the oil from the ruptured well was already gone. [
]Mining stocks also lost ground on Wednesday, trimming strong gains made over the past four sessions.
Rio Tinto <RIO.L> was down 1.4 percent, Xstrata <XTA.L> down 1.5 percent, Anglo American <AAL.L> down 1.8 percent, while BHP Billiton <BLT.L> fell 1.7 percent. The global miner went hostile on Wednesday with its $38.6 billion takeover bid for Canadian fertiliser group Potash Corp <POT.TO>.
But the massive bid unveiled on Tuesday -- coming in the wake of Sanofi-Aventis's <SASY.PA> $20 billion offer for U.S biotech firm Genzyme <GENZ.O> -- has raised hopes that a wave of M&A deals could revive investors' appetite for equities and lift stock indexes out of the summer doldrums.
"Many market pundits had been looking for the next catalysts, perhaps this move from BHP will be the trigger for a raft of M&A activity over the remainder of the year," Ben Potter, analyst at IG Markets, wrote in a note.
"The reason being many corporates are sitting on large hoards of cash earning very little return and may feel better returns can be generated through corporate activity."
Around Europe, UK's FTSE 100 index <
> was down 0.9 percent, Germany's DAX index < > eased 0.6 percent and France's CAC 40 < > lost 0.9 percent.So far this year, the FTSE 100 is down 2 percent, the DAX up 3.5 percent and the CAC down 7.7 percent. The FTSEurofirst 300 is up 0.2 percent and Euro STOXX 50, the euro zone's blue chip index, down 8.4 percent. (Editing by David Holmes)