From FiveThirtyEight:

Soon after the terrorist attacks in Paris earlier this month, when three assailants massacred people in the office of the French satirical newspaper Charlie Hebdo and a kosher supermarket, a researcher at the University of Maryland at College Park carefully logged the details of the violence (location, names of the perpetrators, weapons used, number of fatalities). The attacks became new entries in the Global Terrorism Database, a comprehensive clearinghouse of terrorist acts around the world. The database, housed at the university’s National Consortium for the Study of Terrorism and Responses to Terrorism, includes information on 58,000 bombings, 15,000 assassinations and 6,000 kidnappings going back to 1970.