This just in from England, where Ariana Grande was giving a concert at Manchester Arena.
The explosion reportedly occurred in the foyer area of the arena at around 2230 BST. The North West Ambulance Service tweeted that area residents requiring ambulance services may face delays because "we have a large number of resources at the incident in Manchester."
Inspector Knacker of the Yard offered no further details about the incident. The phrase "Allahu akbar!" has not yet been mentioned. However, Reuters closes its report by noting that the UK is on its second-highest alert level -- "severe" -- meaning an attack by militants is considered highly likely. Fancy that.