Yep, it was due to the fibre cut. I was dispatched to one of our offices in North York to patch one of the DWDM systems over to alternate fibres at around 5:30 yesterday afternoon.
As soon as the node came up I started receiving emails on my BB. ones from the morning.
If it's not someone digging up fibres with a backhoe it's someone pulling down an aerial fibre. Some days you just can't win.