epa04323791 A picture made available on 20 July 2014 shows an Egyptian soldier guarding the site of an attack on a checkpoint which left 21 soldiers dead, 600km south-west of Cairo towards the Libyan border, Farafra, Egypt, 19 July 2014. According to media sources those responsible have yet to be identified, but the current President of Egypt, Abdel Fattah al-Sissi, has vowed the attack will not go unanswered and declared three days of mourning for those who lost their lives. EPA/MOHSEN MOHAMED
