OSLO, Norway — European leaders arriving in Norway to receive the 2012 Nobel Peace Prize say the EU needs more integration and authority to solve problems, including the bloc's financial crisis.

Conceding that the European Union lacked sufficient powers to stop the Bosnia war in the 1990s, European Commission President Jose Manuel Barroso said Sunday it was "one of the most powerful arguments for a stronger European Union."

Barroso was in Oslo with EU Council President Herman Van Rompuy and the president of the EU Parliament, Martin Schulz, to receive this year's award, granted to the European Union for fostering peace on a continent ravaged by war.