All apparently through the mail except for the one to Soros residence which may have been hand delivered? None of them (so far) have actually gone off.
There is a very low probability that small potentially explosive pipe bombs sent through the mail would ever actually reach the addressee. If this operation were to have any impact at all on the mid-term election, on the surface it would seem to potentially swing some voters from Republican to Democrat.
Of course the timing in close proximity to the election could just be coincidental and it certainly possible that they were sent by some nut with a grudge against Dems.
The unsophistication of this operation (he/she/they didn’t even seem to know that John Brennen works for MSNBC, not CNN) portends that the perp or perps will be caught soon and then we will be closer to understanding the motive.