An official website of the United States government Here’s how you know Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock (https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Watch how S&T is developing a layered, integrated capability to detect and mitigate the explosive threat at the speed of the traveling public. (DHS Video by DHS OPA/Released)