(CNN) -- The United States and other countries near Syria are analyzing intelligence reports that the Bashar al-Assad government may have moved some of its chemical weapons in recent weeks, a senior U.S. official told CNN. Over the last 10 days, the United States has been trying to ascertain the legitimacy of the reports but has been unable to make any firm conclusions, according to officials from a number of U.S. government agencies. The movement could be an attempt to consolidate storage because of deteriorating security across Syria, the official said.