How to clear an Emergency Contact Notification process

I accidentally hit the Emergency SOS call (by allowing the sides of my structured purse to squeeze both sides of the phone, thereby hitting the two side buttons simultaneously) and triggered the Emergency Response. The 911 Center Response was canceled. The three Emergency Contacts have been notified and each has telephoned me. BUT -- I am still unable to clear the screen of "Your Emergency Contacts Have Been Notified" and cannot shut off the phone. How do I clear this so I can use the phone again?