Does every blackhole contain a singularity

Question: Does every blackhole contain a singularity
- Keywords:
  black hole,
  singularity
Asked by Lone Wolf to Dominic, James, Jenny, Kevin, Norah on 8 Mar 2017.
- Dominic Doyle answered on 8 Mar 2017:
  
  Yes, I think in principle this is true.
  But of course because we cannot probe or observe anything beyond the event horizon, there is no way to verify this.

Question: Does every blackhole contain a singularity