My employer does a very good job of ensuring that I am safe at work. We have security on site and we have resources that will help us figure out what to do during an emergency. Unfortunately, we live in a time where safety is an issue regardless of where you work, and what you do at any given time. Its important to not let those situations impact your ability to come to work and do your job passionately. You should always ask your employer about what to do in an emergency and ensure they have protocols to manage those situations. If you have better ideas on how to improve security, don't be afraid to voice them.