I'm trying to figure things out from various sources, but it looks as though the launch was successful, the 1st stage had to be blown up after separation, the second stage continued but had to be "terminated" when it was very close to to its planned shutdown. Right now it looks as though it did a lot better than its first flight and will probably be called successful.
The explosion of the first stage was quite spectacular. It looked like a supernova remnant.