Earlier:

  • Reports of an explosion at Manchester Arena (UK)
  • Yen rising - Reports of explosion at Manchester Arena (UK) - more details
  • BBC reporting at least 20 dead in Manchester Arena (UK) explosion (link to a live feed is at this link)

The BBC says the explosion being treated by authorities as a terror incident

Update:

  • Reports of a bomb at Manchester's Victoria train station

(Note - the station had been evacuated a bour or so ago)