The internal memo said groups tied to Iran "historically targeted U.S. interests in response to geopolitical events, and they are likely to increase their efforts in the near term."

FBI and DHS officials cautioned state and local law enforcement of the possibility of threats to U.S. communities, physically and through cyberattacks.

CBS News national security contributor Samantha Vinograd, who is also a former Department of Homeland Security assistant secretary for counterterrorism, speaks with "CBS Mornings" about the U.S. strikes on Iran,