I wonder if the parents were with them or alone at Grand Central.
2 teen tourists from South America stabbed at Grand Central while eating with parents on Christmas
https://abc7ny.com/tourists-stabbed-grand-central-teens-sisters/14226288/
Good question. Back when the cities were safe, I often went to the large railroad station in Chicago on my own. I was 16 and had to take train in from suburbs to see my dentist downtown. Not a good idea today. I wish the best to these two teens.