TOPSHOTS A picture taken on March 18, 2015 shows a placard reading in French "Tunisia will remain standing" during a rally organised a few hours after an attack on the National Bardo Museum in Tunis. Tunisia's president promised to wage a "merciless war against terrorism" after gunmen killed at least 17 foreign tourists and two Tunisians in a daylight attack in the birthplace of the Arab Spring. AFP PHOTO / SOFIENE HAMDAOUI