It is quite distressing to see or hear about such brutal things. I understand why you must be getting disturbed. It also does not help that all media around us continue to bombard us with such gory images.
Next Steps
I suggest you avoid actively watching horror movies or exposing yourself to any content that distresses you as much as possible. You can also try some relaxation techniques like deep breathing and progressive muscular relaxation. Try yoga and meditation; this will help you relax as well as improve your attention and focus. Indulge in some enjoyable activities. Spend time with your family and friends. Put greater effort into your work or studies. All this will help you divert your attention.
Health Tips
If you feel low or anxious, have disturbed sleep or appetite, or have thoughts of suicide or self harm, consult a psychiatrist immediately.