(CBS News) The Pentagon has expanded the list of potential targets for a U.S. military strike on Syria, based on intelligence indicating that the Assad regime has moved around equipment used to deploy chemical weapons in anticipation of a potential attack.

A Pentagon official insisted to CBS News correspondent David Martin that the scope of the operation has not changed, which President Obama has described as limited and tailored. The military began adding new targets to the list as Syrian troops started moving equipment "they think might be targeted and hiding some of it so the U.S. cannot find it again," Martin reports.