Israel air strike kills 73 Palestinians in northern Gaza, Hamas media office says ReutersAt least 73 killed in Israeli strike in northern Gaza, medics say BBC.comLIVE: Huge Israeli attack kills more than 70 in north Gaza’s Beit Lahiya Al Jazeera EnglishIsrael air strike kills 73 Palestinians in northern Gaza- Hamas media Yahoo! VoicesIsraeli strike kills at least 73 people in northern Gaza, medics say The Washington Post