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U.S. Attorney General Eric Holder urged countries in Europe and elsewhere on Tuesday (July 8) to do more to keep their own citizens from traveling to Syria to fight, saying the world cannot allow Syria to become a training ground for extremists to return and launch attacks.

In a speech in Norway, Holder said other countries could learn from U.S. efforts to conduct undercover sting operations and use laws against preparing to commit attacks, tactics he said have helped confront the threat in the United States.

Speaking at the U.S. ambassador's residence in Oslo, Holder also urged Europeans to share information about travelers to Syria with the United States, which does not require visas for travelers from European Union countries.

"We have a mutual and compelling interest in developing shared strategies for confronting the influx of U.S.- and European-born violent extremists into Syria," Holder said, according to prepared remarks