OSLO (Reuters) - President Barack Obama won the Nobel Peace Prize on Friday for giving the world "hope for a better future" and striving for nuclear disarmament, in a surprise award that drew both warm praise and sharp criticism.

The decision to bestow one of the world's top accolades on a president less than nine months into his first term, who has yet to score a major foreign policy success, was greeted with gasps of astonishment from journalists at the announcement in Oslo.

The Norwegian Nobel Committee praised Obama for "his extraordinary efforts to strengthen international diplomacy and cooperation between peoples." But critics -- especially in parts of the Arab and Muslim world -- called its decision premature.

Obama's press secretary woke him with the news before dawn and the president felt "humbled" by the award, a senior administration official said.

When told in an email from Reuters that many people around the world were stunned by the announcement, Obama's senior adviser, David Axelrod, responded: "As are we."

The first African-American to hold his country's highest office, Obama, 48, has called for disarmament and worked to restart the stalled Middle East peace process since taking office in January.

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