`` This partnership will help millions of shoppers across the nation identify and report indicators of terrorism , crime and other threats to law enforcement authorities , '' Napolitano said . DHS expands `` If You See Something , Say Something '' campaign . The Department of Homeland Security is expanding its ``Don't say anything campaign,'' which encourages people to report suspicious activity or behavior and help the government catch perpetrators. 320 Walmarts stores joined Monday , DHS said statement . Program started by New York City 's Metropolitan Transportation Authority .
DHS expands `` If You See Something , Say Something '' campaign . The Department of Homeland Security is expanding its ``Don't say anything campaign,'' which encourages people to report suspicious activity or behavior and help the government catch perpetrators. 320 Walmarts stores joined Monday , DHS said statement . Program started by New York City 's Metropolitan Transportation Authority .