Yes, "lots of people" from that one tweet you say you can't find now.
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From what's being reported the mayor is stating that it was an intentional act but so far they aren't considering an act of terror.
No claims of responsibility. I wonder what information they have which makes them comfortable saying they aren't considering it an act of terror. I would imagine there is surveillance footage available. Maybe it's a copycat or someone being a moron.
It is interesting that no one has life threatening injuries. That does seem to indicate that it wasn't a coordinated terror attack -- has there been an ISIS style attack that had no fatalities?