Israel has ordered a "complete siege" of Gaza, cutting off power, food and water to one of the most densely populated and impoverished strips of land in the world. The fears of Gaza's civilians over Israel's retaliation. Israel says more than 100 hostages are now being held by Hamas militants, with the country vowing to free every last one of them. And though Middle Eastern countries are offering to mediate a prisoner swap, Israel may also decide to use force to rescue those taken captive. Why such an operation could prove to be extremely difficult and dangerous. Hundreds of people were killed in the attacks on Israel by Hamas, including 33-year-old Montreal man Alexandre Look, while several other Canadians are among those missing or captured. What's known about Look's death, and the reaction across Canada to the violence in the Middle East. With Israel and Hamas locked into a violent conflict with no end in sight, people in the neighbouring country of Lebanon are worried that they will be drawn into the crisis as well. The concerns of Lebanon's civilians about the war on the country's doorstep. Plus, international support is pouring in for Israel, as the country ramps up its retaliation efforts after being attacked by Hamas. But there are also fears of the crisis potentially expanding beyond the Middle East, further involving other countries. How the violence may have triggered a global chain reaction.