Three teenagers charged with murder after man stabbed while trying to intervene in Melbourne train station fight

Police arrest 16-year-old, 17-year-old and 18-year-old over savage attack on 22-year-old manFollow our Australia news live blog for latest updatesGet our breaking news email, free app or daily news podcastThree teenagers have been charged with murder after a man who tried to intervene and help a 14-year-old schoolboy was killed in a savage stabbing attack.Emergency crews were called to the Mernda train station in Melbournes north-east on Friday evening after reports of a fight among teenagers.