Israel says 3 hostages bore white flag before being killed by troops

Israeli military acknowledges killing hostages; hostages were shirtless, unarmed, and had a makeshift white flag; killings violated rules of engagement; calls for a pause in the fighting to release more hostages; Palestinian death toll rises; questions raised about Israel's prosecution of the war; families urge government to prioritize captive's freedom; head of Mossad meets with Qatari officials; preliminary inquiry reveals details of the incident; all three hostages killed were kidnapped in October; international criticism of Israeli military's actions in Gaza.