Two teenagers have stabbed a man to death over an argument about conkers in Edmonton, North London.
Steven Grisales, 21, was about to start a course in architecture. It is reported that Grisales was walking to a railway station when the teenagers started hurling conkers at him. When he asked them to stop, one of the youths took out a knife and stabbed him in the heart.
Two 15-year-old boys are being quizzed by police over the killing, and a 19-year-old man and 16-year-old girl have been arrested and bailed.
Grisales died the day after the stabbing, which is said to have taken place at 7pm last Wednesday. From Argentina, he had been awarded a scholarship at Westminster College to study architecture, and arrived in London in July.
Flowers and photos have been left as a makeshift memorial to the victim at the site of the crime. Police are looking for three black males in their late teens or early-twenties, and are appealing for witnesses to come forward.
Police are also planning to return to the scene to trace witnesses.
Detective Inspector Richard Beadle, of Scotland Yard's murder command, said: "It happened in a busy residential area and we know there would have been a number of people in the area at the time of the attack. We really need those people to talk to us."