By Sara Sjolin, MarketWatch

LONDON (MarketWatch)--European stock markets staged broad-based gains on Thursday after European Central Bank President Mario Draghi said the Governing Council was "comfortable" with easing at the next policy meeting.

The Stoxx Europe 600 index rallied 1.1% to close at 339.56, after a volatile trading session.

Helping lift the pan-European benchmark, shares of Barclays PLC (BCS) gained 7.9% after the U.K. bank presented its strategy update, including plans to cut 7,000 jobs at its investment bank by 2016. The bank will also create a bad-bank division consisting of 115 billion pounds ($195 billion) of risk-weighted assets.

Shares of Metro AG gained 2.7% after the German retailer backed its 2014 guidance, even as it reported a widened second-quarter loss due to a strong euro and the timing of Easter.

Shares of BT Group PLC (BT) picked up 2.9% after the telecom company posted a rise in fourth-quarter profit despite lower revenue, as its sports TV channels boosted business.

For the broader markets, the main indexes were sent on a roller-coaster ride in the afternoon, when ECB chief Mario Draghi held his monthly news conference. Draghi said the central bank is "comfortable with acting" at the June meeting, with the caveat that policy makers want to see the June update of staff economic forecasts.

Stock markets spiked on the comments and the euro (EURUSD) instantly started to move lower, trading around $1.3865 at the time of the European close, down from $1.3910 late Wednesday.

"This means that June's announcement will not be a run-of-the mill affair--it increasingly looks as if the central bank will act either to cut rates or buy assets," said Alex Edwards, head of corporate desk at UKForex, said in a note. "That $1.40 level now looks much further away."

The easing hint helped send European banks higher. Shares of Banco Popolare dell'Emilia Romagna Scarl rallied 6.5%, Intesa Sanpaolo SpA climbed 4.6%, Banco Santander SA (SAN) rose 2.4% and Deutsche Bank AG picked up 1.8%.

No change this time

Earlier in the day, the ECB kept its main refinancing rate at a record low of 0.25%. The decision was widely expected, even after the Organization for Economic Cooperation and Development earlier in the week called on the central bank to lower rates immediately to fight off low inflation. Several eurozone politicians have also urged the ECB to stimulate the economy further to take the heat out of the strong euro that could hamper the economic recovery.

At Thursday's meeting, Draghi sarcastically thanked politicians and organizations for the "advice" on the issues, noting that the ECB is an independent institution.

Earlier on Thursday, the Bank of England also kept policy on hold, leaving the key lending rate at a record low 0.5% and making no changes to its 375 billion pound ($635.8 billion) asset-purchase program.

The U.K.'s FTSE 100 index gained 0.6% to 6,839.25, while Germany's DAX 30 index climbed 0.9% to 9,607.40. France's CAC 40 index rose 1.4% to 4,507.24.

China data

In the early morning, investors in Europe found comfort in Chinese trade data that unexpectedly showed both imports and exports improved in April. Exports rose 0.9% last month from a year earlier, swinging back from a 6.6% fall in March and an 18.1% plunge in February, according to China's customs statistics. Meanwhile, imports in April rose 0.8% after a 11.3% decline in March.

The surprising turnaround in the April statistics suggests that China's export growth is gaining momentum, indicating a pickup in global demand.

Russian stocks underperformed most of Europe, however, as a main pro-Russian separatist group in eastern Ukraine said it would go ahead with a secession referendum set for Sunday, according to Interfax. Additionally, the Russian defense ministry said about 15,000 Ukrainian troops have assembled near the border with Russia.

The MICEX index rose 0.6% at 1,371.42, but were earlier in the day mired in red. The ruble (USDRUB) declined against the dollar, with the greenback buying 34.9985, up 0.2% from Wednesday, according to FactSet.

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