The top U.S. commander for NATO says the alliance will begin to improve intelligence-sharing with members and cooperation about the movement of foreign fighters from Iraq and Syria to the U.S. and other Western countries.

Air Force Gen. Philip Breedlove says individual nations have been sharing intelligence but that NATO will begin to take that challenge on more broadly. He says there will be a wider effort to use intelligence to track individuals who could travel to and threaten other Western countries.

Foreign fighters from many Western nations have gone to Iraq and Syria to fight alongside Islamic State militants. Some have tried to return home with the intention of launching attacks.