Go read this article:
and then ponder this, that London, a city of some 8,278,251 as of their 2001 Census, had this to show, "The fight did not appear to be gang-related, police added, but it puts the number of violent teenage deaths in London at 14 so far this year." 14 this year! In a city of surely now 8 1/2 million people, they have had 14 violent teenage deaths.
Compare that with this data:
Homicide is the second leading cause of death among young people ages 10 to 24 overall. In this age group, it is the leading cause of death for African-Americans, the second leading cause of death for Hispanics, and the third leading cause of death for American Indians, Alaskan Natives, and Asian Pacific Islanders (Anderson and Smith 2003). In 2001, 5,486 young people ages 10 to 24 were murdered, an average of 15 each day (CDC 2004). In 2001, 79% of homicide victims ages 10 to 24 were killed with firearms (CDC 2004).
So, in a country of 300 million, we had 5,486 murders among 10 to 24 year olds, or one murder per 54,684 people (I know that not all citizens are teenagers). In a city of 8,300,000, they've had 14 murders, or one murder per 592,857 people. That's amazing.