WASHINGTON — A U.S. defense official says international intelligence sources have detected that Syria has been moving chemical weapons components in recent days.

The official says U.S. and allied intelligence officials have detected activity around more than one of Syria's chemical weapons sites in the last week. He spoke on condition of anonymity because he was not authorized to speak publicly about intelligence matters.

He says officials don't believe any developments with the weapons are imminent but are trying to figure out what the Syrians are doing.