Members of Palestinian Civil Defence reenact a scene simulating the evacuation of a child during a drill, at building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





A member of Palestinian security forces loyal to Hamas reacts during a reenactment of evacuation scene at a drill, in front of a building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





Medics and members of Palestinian Civil Defence reenact a scene simulating the evacuation of a victim during a drill, at a building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





Members of Palestinian Civil Defence reenact a scene simulating the evacuation of a man during a drill, at a building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





Palestinian policemen loyal to Hamas run as they reenact a scene of an explosion during a drill, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





Medics and members of Palestinian Civil Defence reenact a scene simulating the evacuation of a victim during a drill, at a building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





Members of Palestinian Civil Defence reenact a scene simulating the evacuation of a man during a drill, at a building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





A Palestinian medic reenacts a scene simulating the evacuation of a man during a drill, at a building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





Medics and members of Palestinian Civil Defence reenact a scene simulating the evacuation of a girl during a drill, at a building destroyed during the 2014 war, in Gaza City April 19, 2016. (Photo by Suhaib Salem/Reuters)





Members of the National Gendarmerie Intervention Group (GIGN) stand in position prior to a training exercise in the event of a terrorist attack, in the presence of the French Interior Minister Bernard Cazeneuve with members of the National Gendarmerie Intervention Group (GIGN) and Recherche Assistance Intervention Dissuasion (RAID) at la Gare Montparnasse, center in Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





A member of the Research and Intervention Brigades (BRI) manipulates a drone prior to a training exercise in the event of a terrorist attack, in presence of the French Interior Minister Bernard Cazeneuve with members of the National Gendarmerie Intervention Group (GIGN) and Recherche Assistance Intervention Dissuasion (RAID) at la Gare Montparnasse, center in Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Members of the National Gendarmerie Intervention Group (GIGN) are pictured during a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, in Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Members of the National Gendarmerie Intervention Group (GIGN) are pictured during a training exercise in case of a terrorist attack, in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in the presence of French Interior Minister Bernard Cazeneuve at la Gare Montparnasse, center Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Duncan, one of the dogs, and a member of the National Gendarmerie Intervention Group (GIGN) are pictured during a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, in Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Duncan, one of the dogs, and a member of the National Gendarmerie Intervention Group (GIGN) is pictured during a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, in central Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Members of the National Gendarmerie Intervention Group (GIGN) stand in position during a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, in central Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





A member of the National Gendarmerie Intervention Group (GIGN) stands in position during a training exercise in the event of a terrorist attack, in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) and in the presence of the French Interior Minister Bernard Cazeneuve at la Gare Montparnasse, center Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Members of the National Gendarmerie Intervention Group (GIGN) are pictured during a training exercise in the event of a terrorist attack, in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in the presence of the French Interior Minister Bernard Cazeneuve at la Gare Montparnasse, center Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Members of the National Gendarmerie Intervention Group (GIGN) are pictured following a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, center Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





A member of the National Gendarmerie Intervention Group (GIGN) is pictured as he controls one of the supposed terrorists during a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, in central Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





A member of the National Gendarmerie Intervention Group (GIGN) deactivates a bomb from a supposed terrorist during a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, in central Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





A member of the National Gendarmerie Intervention Group (GIGN) stands in position during a training exercise in the event of a terrorist attack in presence of the French Interior Minister Bernard Cazeneuve with members of the National Gendarmerie Intervention Group (GIGN) and Recherche Assistance Intervention Dissuasion (RAID) at la Gare Montparnasse, center in Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





Members of the National Gendarmerie Intervention Group (GIGN) are pictured following a training exercise in the event of a terrorist attack in collaboration with Recherche Assistance Intervention Dissuasion (RAID) and Research and Intervention Brigades (BRI) in presence of the French Interior minister Bernard Cazeneuve at la Gare Montparnasse, center Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)





A member of the Research and Intervention Brigades (BRI) controls a drone prior to a training exercise, in the event of a terrorist attack, in the presence of the French Interior Minister Bernard Cazeneuve (unseen), members of the National Gendarmerie Intervention Group (GIGN) and Recherche Assistance Intervention Dissuasion (RAID) at la Gare Montparnasse, in central Paris on April 20, 2016. (Photo by Miguel Medina/Reuters)