On 21 October 2019, the French anti-terrorism prosecutor’s office announced that the investigation into the 2015 terror attacks in Paris, France, had concluded. It took French authorities four years to complete the investigation. The attacks targeted outdoor cafes, a stadium, and a concert hall – resulting in 130 deaths and another 352 injured. The investigation revealed that a larger jihadist cell was behind the complex coordinated terrorist attacks (CCTA), reaching across Europe but particularly Belgium, which was later also targeted by the cell. The result of the French investigation has led to the indictments of at least 20 suspects and the discovery of many lessons learned.