We had another attack on the network and the chain was forked. Miners lost blocks between 18K and ~34K.

This was a very complex attack and nearly 3M BMB were stolen by attackers in total. The stolen funds have been recovered and placed in a community account.

Details on the origins of the attack and it's mitigation are available in this post-mortem:
https://www.dropbox.com/s/12b8js0kvfvtv79/Bamboo_Attack_Post-Mortem.pdf?dl=1