See something.

Say something.

From DHS Website:

There can be moments in our day that cause us to pause and ask, “Is this typical of my every day?” If it’s not, speak up. Don't be afraid to say something if you see something that doesn't seem right.

Whether you are on your way to work, walking in your neighborhood, or out and about in your community, remember: We all play a role in keeping our communities safe. Remember to stay vigilant and say something when you see signs of suspicious activity. Familiarize yourself with the signs of terrorism-related suspicious activity and when you notice something out of the ordinary, report who or what you saw, when you saw it, where it occurred and why it's suspicious to local authorities (or 9-1-1, in case of an emergency).

https://www.dhs.gov/see-something-say-something

We see you DS.

WWG1WGA