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By Tarek Amara TUNIS (Reuters) - Tunisian authorities said on Wednesday a suicide bomber wearing a vest packed with plastic explosive blew up a presidential guard bus a day earlier, killing at least 12 troops in an attack claimed by Islamic State militants. Tuesday's explosion on a main boulevard in the capital drove home the vulnerability of Tunisia to Islamist militancy, following assaults on a seaside tourist hotel in June and the Bardo Museum in Tunis in March also claimed by Islamic State. One of the Arab world's most secular nations, Tunisia has increasingly become a target for militants after being hailed as a beacon of democratic change in the region since its 2011 uprising ousted autocrat Zine Abidine Ben Ali.
By Nick Tattersall and Vladimir Soldatkin ISTANBUL/NIZHNY TAGIL, Russia (Reuters) - Russia sent an advanced missile system to Syria on Wednesday to protect its jets operating there and pledged its air force would keep flying missions near Turkish air space, sounding a defiant note after Turkey shot down a Russian fighter jet. The downing of the jet on Tuesday was one of the most serious publicly acknowledged clashes between a NATO member and Russia for half a century, and further complicated international efforts to battle Islamic State militants in Syria. Russian officials expressed fury over Turkey's actions, and spoke of retaliatory measures that were likely to include curbing travel by Russian tourists to Turkish resorts and some restrictions on trade.