* Fall in GDF Suez weighs on France's CAC index
* Traders cite Iraq violence as reason for equity pullback
* FTSEurofirst 300 closes down 1.1 pct at 1,372.04 points
* FTSEurofirst 300 ends at 3-week low
By Sudip Kar-Gupta
LONDON, June 25 (Reuters) - European shares fell on Wednesday, with utility GDF Suez a standout loser, as traders cited fears that violence in Iraq will escalate further as a cue for investors to cash in on last month's equity rally.
The pan-European FTSEurofirst 300 index ended down by 1.1 percent at 1,372.04 points, marking its lowest level in around three weeks.
France's CAC underperformed with a 1.3 percent decline, hit by a 2.3-percent drop in utility GDF Suez after the French state sold a 3.1 percent stake at 20.18 euros per share, the bottom of a range set by bookrunners.
Traders said the conflict in Iraq was providing investors with a reason to cash in on last month's rally, which saw Germany's DAX hit a record of 10,050.98 points while the FTSEurofirst rose to a 6-1/2 year high of 1,399.62 points.
"We're coming in for some healthy gains, and the tendency is to cash in those gains," said Mirabaud Securities equity sales executive Rupert Baker.
Although the price of oil edged down, traders said events in Iraq remained worrying enough to justify trimming equity positions in case the situation deteriorated.
Militants attacked one of Iraq's largest air bases and seized control of several small oilfields on Wednesday as U.S. military experts arrived to set up an operations centre to help Iraqi security forces counter a mounting Sunni insurgency.
"Investors are still concerned about American foreign policy and what will be the next step in terms of any military intervention as opposed to diplomacy in the Middle East region," said B Capital managing director Lorne Baring.
Mike Turner, European equity options broker at XBZ Ltd, said the longer-term trend for European stock markets remained positive, with markets supported by economic stimulus measures from the European Central Bank (ECB).
However, he added that concerns over Iraq would peg back those markets in the near-term.
"We're still in reasonable shape, but we were looking a bit toppy on the upside, and there are one or two jitters around."
Europe bourses in 2014: link.reuters.com/pap87v
Asset performance in 2014: link.reuters.com/gap87v
Today's European research round-up (Additional reporting by Blaise Robinson and Atul Prakash; Editing by Louise Ireland and Louise Heavens)