November 2015 Paris attacks
France had been on high alert for terrorist threats since the Charlie Hebdo shooting in early January 2015 and other related incidents during the January 2015 Île-de-France attacks. France had also increased security in anticipation of the 2015 United Nations Climate Change Conference, scheduled to be held in Paris from 30 November to 11 December 2015, and had restored border checks the week before the attacks.