threaten at work

In these times, a threat to shoot co-workers is and always should be deemed serious, even if the employee making such a threat only intended it as a (very stupid) joke.  The employer is required to maintain a safe work environment and if you are injured because he falied to address a known risk, the employer is liable for any and all injuries.  Being shot, however, is a risk people want to avoid. If the employer fails to act, you could inform him you will resign for good reason (safety) if he does not take appropriate action.  This will allow you to obtain unemployment benefits. If you are more interested in keeping your job, then you can inform the employer that you will have to report this to the police if he does not take action.  Depending on how volitle this employee is, appropriate action may require the employee's termination.  You would have a the right to file a lawsuit if the employer were to terminate you for reporting this to the police