The maps below show fatal terrorist attacks worldwide, month by month. Circle sizes signify number of victims. The data were collected by the University of Maryland, which defines terrorism as "threatened or actual use of illegal force and violence by a non‐state actor to attain a political, economic, religious, or social goal through fear, coercion, or intimidation." See the database documentation for the group's complete criteria for counting attacks as terrorism.

MORE: Infographic of all terrorism deaths, country by country