Yezzir, seems like it. No one has claimed responsibility but it's being treated as a terror attack, at least by authorities.

Greater Manchester Police say at least 19 people are confirmed dead in what is being treated as a "terrorist incident until police know otherwise" at Manchester Arena.

Bunch of kids here, this is all bad, man. Can't see something inadvertently blowing up twice, Ill go ahead and call it. This is gonna dominate BBC and related news cycles forever, terror + kids = international outrage. We shot off 50 bil worth of ordinance at an empty airbase because of pictures of terrorized kids in Syria. If a radical terrorist group claims this, this could turn into a really bad incident of civil unrest. The public will want its pound of flesh.

This is like the Shark Week of terrorism/tragedy. NYC, the additional campus stabbing, the double homicide thing where the white supremacist guy converted Islam and killed his two Neo Nazi roommates* because they wouldn't convert. I'm not making this shit up; you can't come up with something like that without writers.

And now this. It's starting to feel surreal again folks, these are indeed strange days.

* http://www.alternet.org/fbi-busts-atomwaffen-neo-nazi-florida-and-finds-explosive-radiation-materials