By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stock markets rose for a second straight day on Thursday as European Central Bank President Mario Draghi reassured investors that the bank stands ready to launch more stimulus measures to fight off low inflation and boost growth.

Dovish Draghi: In an interview with Lithuanian business publication Verslo Zinios, the ECB boss reiterated the central bank will "use additional unconventional instruments within our mandate" if necessary to combat a "too prolonged period of low inflation." Economists expect the "unconventional" stimulus measures could be a full-scale quantitative-easing program.

The comments also echoed remarks Draghi made in the European Parliament on Monday.

The ECB meets next Thursday, but after announcing a rate cut and a "mini" QE package at the September meeting, the central bank is likely to keep monetary policy on hold in October.

Market reaction: Stock markets added to gains from Wednesday, when another lackluster data-set out of Germany, heightened expectations the ECB may take more aggressive steps to invigorate the sluggish eurozone economy.

The Stoxx Europe 600 index rose 0.3% to 345.47 on Thursday. Also reacting to Draghi's dovish comments, the euro (EURUSD) against the dollar, trading at $1.2713, from $1.2780 late Wednesday in New York.

"The prospect that further ECB action will eventually occur is likely to maintain downward pressure on the euro," said Howard Archer, chief U.K. and European economist at IHS Global Insight, in a note. "This is clearly helpful for eurozone growth prospects and a development that the ECB is far from unhappy to see."

Germany's DAX 30 index put on 0.3% to 9,692.10, while France's CAC 40 index gained 0.2% to 4,423.96. The U.K.'s FTSE 100 index , however, slipped 0.1% to 6,699.97.

Major movers: Shares of Hennes & Mauritz AB slid 3.6% after the Swedish fashion retailer said sales in the fiscal fourth quarter got off to a slow start.

Air France-KLM rose 2.8% after the airline said it has given up on plans to expand its Transavia low-cost airline across Europe, in a bid to halt a strike by its French pilots. Read about more about European stock movers.

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