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The chatter was that some element was planning on bumrushing the inaugeration.
DI believed they intended to use weapons and ammo smuggled by the cartels.
Reports suggested that 1% and mexican motorcycle gangs would be used to smuggle the weapons.

Foreign Intelligence assets on the ground in the U.s. directed disposable street gangs, and elements placed in the military, to affect the theft of humvees and police and military uniforms during the fires in california.

This was also the reason that leftwingers were being told to wear black "for a day of mourning", so security would be distracted by too many people dressed suspiciously, while an attack was carried out.

The police in D.C. did not in fact refuse to help the inauguration. Trump's own security refused them. To save face, the rumor was put out that the locals refused to cooperate.

Trump's security lookalike, a common practice with heads of state, stood in for him on the off-chance there was some unknown reason for why outside or inside actors would want the venue changed to indoors (there were security discussions about things like CBRN concerns).

There was also discussion that elements of the parties might try a legal approach. Because his SD was used, rather than him, they could later argue he wasn't actually inaugurated, but this overrode the immediate threat.

There is now also talk that the previous administration may have issued post-handover orders (timelocked orders to be executed at specific dates) to both the intelligence agencies and the military, though those are expected to be quickly overridden and rescinded.

The diplomatic cables of the iranians indicate they are worried that Trump will go to war with them over turkish and israeli interests, and that if they don't act, they'll be blamed anyway for things outside their control.