SYDNEY — Australians on Thursday began a national day of mourning for the 15 people killed by gunmen who opened fire at a crowd assembled at Bondi Beach on December 14.”Today is an opportunity for usSYDNEY — Australians on Thursday began a national day of mourning for the 15 people killed by gunmen who opened fire at a crowd assembled at Bondi Beach on December 14.”Today is an opportunity for us


