It's a nightmare scenario: You're at a mall, shopping with friends. Or maybe buying some last-minute groceries for dinner. All of a sudden, you hear gunshots.
원문출처 : https://www.cnn.com/2021/04/18/us/active-shooter-what-to-do-trnd/index.html
원문출처 : https://www.cnn.com/2021/04/18/us/active-shooter-what-to-do-trnd/index.html