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This one is too close to home. Seems pretty clear it was an attack (Uk politican leader has said it was an attack) - Police seen dragging someone from car suggests they are believe it to be so.
Just hope the final toll is as low as reasonably hopeful
They've said they're treating it as an attack based on protocol.
I've seen some people saying it was a nail bomb set off just outside the building, where people were exiting.
But nothing is known for certain.