Home Homeland Security: PSA Homeland Security: PSA Tips on how to spot terrorism. DIAL 911 If this is an emergency, or a crime, please dial 911 immediately. Submit a Tip You can play an important role in homeland security by being vigilant and watching for signs of terrorist, criminal or suspicious activity. We depend on your assistance in reporting the details of what you see while remaining anonymous if you wish. Or if you like, Call - (602) 644-5805