COPENHAGEN, Denmark—Norwegian authorities said Tuesday they have given up hope of finding survivors of a landslide that swept away homes in a residential area almost a week ago, killing seven people. Three people are still missing from the Dec. 30 disaster that destroyed at least nine buildings with more than 30 apartments in the village of Ask, located 25 kilometers (16 miles) northeast of Oslo. The landslide was among the worst in modern Norwegian history. “It is with great sadness that I must say that we no longer have any hope of finding people alive after the landslide,” local police chief Ida Melbo Oeystese said. “We have done everything in our power. But this natural disaster had significant forces. Those who died have died relatively quickly,” she added, visibly moved. Search crews will continue “working to find everyone who is missing,” Oeystese said. The police chief spoke hours after a …