TWO boys as young as 10 are wanted by police over an attack at a southern Sydney railway station that has left a Scottish tourist fighting for his life.Last night Mark Willis, 25, from Glasgow, was in a critical condition in St George Hospital after undergoing emergency neurosurgery after the assault at Rockdale at 3.25am yesterday.Mr Willis and his girlfriend, Jane McLean, had been in the city and had just got off the bus at Rockdale railway station on their way home when Mr Willis became involved in an argument with four boys.Police would not reveal the nature of argument but when one of the boys king-hit Mr Willis he fell and hit his head on the footpath.Detective Superintendent Helen Begg said Ms McLean, who was not hurt in the attack, was working with police to identify the four boys.”The ages of these people who have committed this offence are very young. I am very concerned,” Superintendent Begg said.”It was the early hours of the morning. I would seek any assistance from the children or their parents in bringing closure to this matter.”Two of the boys have been described as being aged between 10 and 14, between 150 and 160 centimetres tall, with dark complexions, dark hair and wearing hooded jumpers.The other two are described as between 12 and 15, between 170 and 175 centimetres tall and also dark-haired. One wore a grey zip-up jacket, the other a white Henleys hooded jumper.Mr Willis and Ms McLean arrived in Australia on a 12-month working visa in December and had planned to hire a camper van and drive around the country.He had written on his Facebook page that he had come to to have a ”break from Glasgow and to see some of the world”.”No job yet but im sure I will get something after new year. Just gonny party till then! Yeeeeehaaaaaaa!” he wrote.Family members from Scotland were on their way to be with him in Sydney.Police also want to talk to a man who came to the aid of the couple and called an ambulance from a public pay phone, and also a woman, who was on the bus with the couple and who spoke to the boys.The woman is described as aged between 20 and 25 with long black hair and was wearing a long-sleeved pink jacket and blue jeans.