The search for a 24-year-old hiker missing in Kosciuszko national park since Boxing Day has entered its sixth day, with the man’s sister expressing fears about potential threats to his safety. Hadi Nazari, an experienced hiker whose birthday was on Tuesday, has not been seen since, when friends had descending the Hannels Spur Trail at Geehi, between Khancoban and Thredbo, on Thursday. When he didn’t arrive at the Geehi campground as expected, his two friends – aged 23 and 24 – began searching for him. Sign up for Guardian Australia’s breaking news email Acting Supt Jillian Gibson said the area