Russia holds a national day of mourning for the victims of Friday's attack at a Moscow concert hall. While ISIS has claimed responsibility - the Kremlin is placing the blame on Ukraine. Also: Organizations trying to get aid into Gaza face more hurdles - as the federal government is still struggling to get family members of Canadians out of the territory. Plus: Foreign correspondents in Rome are the new tenants of a 16th-century palace - which was once the political headquarters of one of Italy's most infamous leaders.