The fork could have happened on block 494 784. This block, and even the next block were mined by Antpool (miner who didn't state he was supporting Segwit2x).
After this block being mined, no news were spread about implementing a fork.
Nevertheless, a few hours before block 494 784 being mined, some were expecting that the fork would happen and hoping that a new chain would come to life.
Look at this tweet:
Actually only 9% of miners were supporting Segwit2x.
So even though Segwit2x did not happen, some damage were done by a small group of people
Coinbase got fooled and temporarily stopped all BTC transactions.
Hence the general confusion... and this thread....