Police are questioning two men in their twenties over a stabbing attack on three teenagers that left one dead.
The youths were found with stab wounds in a third-floor flat in a high-rise block on a housing estate in Erith, south east London.
Police have named the dead teenager as Fraidon Alizada, 18, from Bexley
Neighbours have described the flat where the teenagers were attacked as a "crack den". They said the victims were believed to be three young Somali men who lived there.
One neighbour said: "There was always a lot of stuff going on there with drugs. It's been going on for months. Someone has been running a crack den out of there. They were always throwing needles out of the window and there was always banging coming from inside."
Another resident, a young mother, said the block was used as a dumping ground for people kicked out of other flats.
She said: "All the drug dealers and people who've been kicked out of other flats get moved in here. It's just getting worse every year."
Police arrested two men who are being held at a south London police station.
They were called to Verona House on Waterhead Close and found the three youths, all thought to be in their mid to late teens, with stab wounds.
Fraidon was pronounced dead at the scene. Another youth was seriously hurt and is in a stable condition at Royal London Hospital. The third was discharged.
