We can confirm that there was a successful 51% attack on Ethereum Classic
Some updates. Money stolen about $1.1m:>exchange has since uncovered another 12 attacks that “included double spends, [now] totaling 219,500 ETC ($1.1 million) https://thenextweb.com/hardfork/2019/01/08/ehtereum-classic-...Cost of attack according to https://www.crypto51.app/ about $5k