Saudi-led coalition launched the attack after rebels fired at the kingdom
                                
                                
                                    (Newser) -
                                    An airstrike hit a bus in a market in northern Yemen on Thursday, killing at least 43 people, including children, and wounding as many as 63, according to Yemen's rebel-run Health Ministry. The airstrike came from the Saudi-led coalition fighting Shiite Houthi rebels in the country, and the coalition...