Palestinians commemorated Friday the 40th anniversary of the horrific killings in the Sabra and Shatila refugee camps in Beirut that left hundreds of people dead during Israel’s 1982 invasion of Lebanon. Dozens of people from Europe who support the Palestinian cause also took part in the memorial held in Beirut close to where the men, women and children were killed by Israeli-backed Lebanese Christian militiamen. Over three days in September of that year, the Christian militia swept through Shatila camp, and its sister area of Sabra, slaughtering hundreds of Palestinian men, women and children…