One day last summer, as anti-government protests roiled Istanbul, a 14-year-old boy named Berkin Elvan was on his way to buy bread when he was struck in the head by a tear gas canister. After spending months in a coma, Berkin died this week -- reigniting anger at Prime Minister Recep Tayyip Erdogan and sending thousands back into the streets in dozens of cities. Riot police were quick to react, disrupting demonstrations with water cannons, clubs, and more tear gas. At least two were killed, dozens more injured. Opposition groups are calling for further protests and are still seeking the ouster of Prime Minister Erdogan.