A teenage schoolboy severely allergic to dairy has died after cheese from a sandwich was flicked in his mouth.
Karanbir Cheema, 13, died 12 days after the incident at his London high school in June.
It's alleged Karanbir, known as Karan, had the food flicked into his mouth by a fellow classmate.
One pupil tweeted on the day he incident took place, saying: "A boy in the class bought himself a cheese sandwich and another boy asked to have a piece of it.
"He gave the cheese to him thinking that he would eat it but instead he flicked it at Karan.
"People are saying that it hit [Karanbir's] lip, which he then licked by accident."
The Metropolitian Police said in a statement that a "13-year-old boy, a pupil at the same school, was arrested on Wednesday, June 28, and interviewed in connection with the incident."
The Homicide and Major Crime Command are investigating.