Sadly, this wasn’t the first Englishwoman who lost her son to a brutal death at the hands of unassimilable and acrimonious foreign invaders, and it won’t be the last. I recall reading this article last year...
“On April 28, 2001, Ray and Vi remarried. Life seemed pretty much perfect. Then, a month later, on May 25, 18-year-old Chris went out with Phil, 17, for the evening. When the doorbell rang after midnight, Ray found two policemen standing there. They said there had been a fight, and Chris was badly injured. He had been walking down a nearby street with Phil, innocently singing Champagne Supernova by Oasis. A gang of nine youths attacked Phil for no reason and when Chris tried to help his brother, he was kicked to the ground as well. The gang used Chris’s head as a football, throwing his unconscious body into the road where he was hit then dragged along by a car.”
It sounds like the two killers in your story were native British.
http://www.dailymail.co.uk/news/article-124024/Life-sentences-penalty-kicks-murder-teenager.html
The law over there doesn’t allow for their pictures to be shown due to age.