Story highlights Homeland Security Secretary Jeh Johnson said U.S. aviation officials "make adjustments all the time"

Johnson on Friday announced security enhancements that include expanded screening to all items on aircraft and airport assessments alongside foreign countries

Washington (CNN) Homeland Security Secretary Jeh Johnson is seeking to reassure the American public that security officials are evaluating terror threats in the wake of last week's crash of a Russian plane over the Sinai Peninsula.

"I want people to know that their aviation security officials, working on their behalf, are continually evaluating threats, potential threats, and we make adjustments all the time based on what we see," Johnson told CNN's Barbara Starr in an interview that aired Saturday.

Johnson on Friday announced security enhancements that include expanded screening to all items on aircraft and airport assessments alongside foreign countries.

"This is why we determined to take precautionary interim steps while this investigation is still ongoing. ISIL is out there now, active in a lot of different areas, and so while this investigation is pending -- and cause we have this group claiming responsibility -- we believe it's significant to do these things on an interim basis and to tell the public that we've done this," Johnson told Starr.

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