By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European stocks dropped Friday, as an escalation of violence in Iraq sent energy prices soaring, while investors assessed comments from Bank of England Governor Mark Carney on the next rate hike.

The Stoxx Europe 600 fell 0.8% to 345.08, but oil producers were among the top advancers, with Repsol SA gaining 1%, Royal Dutch Shell PLC up 0.9% and Total SA higher by 0.8%.

Crude-oil prices surged on concerns that unrest in Iraq could lead to disruptions in the country's oil supplies. Islamist militants have reportedly taken full control of the northern oil city of Kirkuk and vowed to march to Baghdad. Iraq is the second-largest oil producer in the Organization of the Petroleum Exporting Countries. But on Friday, the International Energy Agency said supplies in the country aren't at immediate risk.

Crude-oil futures (CLN4) pushed higher than $107 a barrel, and August Brent traded above $112 a barrel. The U.S. crude benchmark on Thursday settled at its highest level in nearly nine months.

As oil prices jumped, shares of air carriers EasyJet PLC and Ryanair Holdings PLC fell 4.1% and 3.3%, respectively. Retail shares were also pulled lower, with Germany's Metro AG losing 0.9%, Sweden's Hennes & Mauritz AB off 0.5% and Swiss luxury-goods company Cie. Financière Richemont SA lower by 1.6%.

The spike in oil prices come at a time of sluggish economic growth in Europe, which the European Central Bank plans to tackle with recently launched measures aimed at encouraging lending by banks and spending by consumers.

In Germany, the DAX 30 index fell 0.9% to 9,847.38, and France's CAC 40 index lost 0.9% to 4,511.70.

Meanwhile, U.K. stocks were hit by the prospect of higher interest rates. The U.K.'s FTSE 100 index dropped 1.1% to 6,769.54 after BOE chief Carney said an interest-rate increase may come sooner than the markets currently anticipate. "Growth has been much stronger, and unemployment has fallen much faster than either we or anyone else expected," a year ago, Carney said late Thursday in a speech at Mansion House in London.

Markets had been pricing in a rate hike in around the second quarter of 2015, but two-year swap rates have risen more than 15 basis points on Thursday's level, said Berenberg in a note Friday.

"We expect the first hike in November 2014. The change in tone was sensible, in our view. Record low interest rates are increasingly unnecessary," wrote Rob Wood, chief U.K. economist at Berenberg.

Also speaking at Mansion House, Britain's finance minister George Osborne said Thursday he would give the central bank greater power to curb mortgage lending, in a bid to reduce any risks from the housing market to financial stability.

Shares of British residential property firm Barratt Developments PLC fell 5.8% and Persimmon PLC lost 6.1% and Berkeley Group Holdings PLC fell 5.5%.

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