Jordanian policemen stand guard during a rally in the capital Amman on December 23, 2016 to support security services after a shooting attack in Karak last week. The attack on December 18 in Karak, home to one of the region's biggest Crusader castles, killed seven policemen and two Jordanian civilians as well as a female Canadian tourist. Four assailants were killed by the security forces after an hours-long siege of the castle, where the suspects had fled after opening fire on police. IS on December 20 claimed responsibility, saying it was carried out by four "soldiers of the caliphate" who used machineguns and hand grenades. / AFP / KHALIL MAZRAAWI (Photo credit should read KHALIL MAZRAAWI/AFP/Getty Images)