Yes, there was a news about attack on bitcoin network and some people were saying that the transaction were not getting confirmed due to that. However, I doubt there was an attack of any sort. The confirmation was getting delayed due to the congestion of transactions and unavailability of active nodes. But everything has come back on track now and the number of unconfirmed transactions has also reduced a lot.
Not sure what the lack of active nodes has to do with it? It was simply a case of incoming transactions being generated faster than the miners could put them into blocks... which is partly related to the whole blocksize issue... imagine if we could store up to twice as many transactions in a single block! *cough*SegWit*cough*
The "attack" part of it comes from the theory that "bad people"™ were generating thousands upon thousands of transactions and purposely flooding the mempool. Why someone would want to do this, is the topic for a different discussion.