Turns out an ISIS dude tweeted just a few hours before the concert warning of an attack. Not very good at english though.
An unverified Twitter account posted two messages and an image of an ISIS flag.
The messages appeared to predict the atrocity at the arena filled with 21,000 fans.
One message said: “Are you forget our threat?”
Followed by: “This is just the beginning.”
The tweets, which are not verified, are time-stamped at 6.24pm, four hours before the bomb went off.
TOTALLY NOT ISIS GUYS!!!