Officer or Mercenary,
I would request that any large shipments entering the gates be inspected for explosives, especially by unknown parties. I've reason to believe men meaning Sanctuary harm will attempt to smuggle these explosives back in. If found the carriers are requested to be detained and the explosives confiscated as evidence.
I expect them to come through the obvious routes, the Gates and the Canal.
Mercenaries, there is also a Warehouse in the Canal Ward that may be used to smuggle them back in. Mordur would know which one, I'd wish it checked regularily.
Sincerely,
Councilor Reynolt