|Pages in this category should be moved to subcategories where applicable. This category may require frequent maintenance to avoid becoming too large. It should directly contain very few, if any, pages and should mainly contain subcategories.|
This category has the following 9 subcategories, out of 9 total.
- 21st-century murder (36 C, 1 P)
- Terrorist incidents in the 21st century (4 C, 1 P)