Terror group releases video of alleged gunman Kujtim Fejzulai pledging allegiance to caliph, hails him for targeting 'gatherings of Crusaders' in Austrian capital

After shooting attack in Vienna, head of Conference of European Rabbis says religious leaders 'must show their loyalty to the laws that apply here'

Austrian police detain 14 after shooting rampage that killed 4; Kujtim Fejzulai, 20, posed on Instagram with weapons before attack, wore fake explosive belt, was IS sympathizer

Vienna had until now been spared the sort of major Islamist terrorist attacks that have hit other European countries

PM says 'savagery of resurgent Islamist terrorism' must be defeated, as world leaders send swift denunciations of deadly shooting

Manhunt continues for at least one assailant; 15 wounded in assault that targeted 6 locations, starting outside synagogue; Austrian leader won't rule out anti-Semitic motive

Czech police set up border inspections, increase security at Jewish sites; European leaders express solidarity with Austria, vow not to give in to 'hate'