I really like the line you took with sealed indictments. They could be 'booms' of one kind or another at any rate. Each could indicate the collateral damage involved.

The '57' line could be promising too- MK's as unexploded bombs, the pairing with the shooting seems to work too.

These recent ones look both to have been defused- one on a train track (stopped a train going 'off the rails'), and the other defused from a rather more unlikely cavity but with the same success (single, self-reported 'driver' case?)- disasters averted.