At the end of Argo, right after the supposed film team is allowed to board their plane, Iranian soldiers storm the house of the Canadian ambassador. They find a desolated home and what I think to be a destroyed phone, or rather something like an advanced phone with a kind of encryption device, or whatever this is called. But immediately after they see this they frantically run out and try to phone the people at the airport and then hurriedly run to the airport guards, as if they had realized what was going on.
Yet I'm not sure what conclusions they drew from this and why they realized something bad was going on. All they saw was such a destroyed phone-thingy, which I would guess every ambassador would have (Mendez definitely didn't bring it with him) and that the ambassador was gone, which I'm not sure was such a bad or unexpected event for them, he wasn't an enemy of Iran at all. How did they realize that there were other people there or that those were something else than what they reported, and that they should immediately head for the airport?
Did they just do this out of security and didn't really know what to look for (but what made them so suspicious then)? Or did the filmmakers maybe leap over some deductions in order to raise the tension? Or am I just dumber or more naive than the Iranian military and overlooked something in the story?