Doctors Without Borders says Saudi airstrike injured at least 20
                                
                                
                                    (Newser) -
                                    A Saudi-led coalition airstrike hit a hospital supported by Doctors Without Borders in northern Yemen on Monday, reports the  AFP , killing at least six and wounding 20. The group, known by the French acronym MSF, said the strike hit near the Houthi rebel stronghold of Saada, where teams were still...