They are in panic mode. Anything will be a device till they know it is not.
Don’t blame them for that. First priority is making sure there are no more bombs (if it was a bomb). Then they need to process the scene.
The medics are the guys with big steel ones. They have to go into the area, triage the wounded, while it might be “active”.
Prayers for the victims . . .
Got a text from a friend there. They were watching the race, and the cops on the scene are saying “Bomb”. Still to early to know for sure, but it doesn’t look good.
Before anyone says anything, in the first few hours you can count on the first reports to be not quite right. The cops are still in shock, like everyone else.