Ariana Grande has canceled shows in London and put her tour on hold following Monday's bombing at a concert in Manchester that killed 22 people and injured dozens more.
Yesterday Britain's prime minister Theresa May put the country on high alert, deploying the military to help guard against another attack while police investigate whether more people were involved in Monday's bombing.
And while this all happened an ocean away, the sight of an attack on a teen pop concert might have you thinking about what you would do in the case of a crisis.
Jeannie Yandel spoke with Officer Simon Phillips, community engagement officer with the University of Washington Police Department, about how to respond and whether you should do anything differently when you go to big events. Phillips worked in anti-terrorism with the British Military and teaches people how to prepare themselves for a possible attack.