On the way back from the library, another three police cars had accumulated, and there was an all-black version of the battalion-chief SUVs pulled up athwart the alley opening. Still not much in the way of observable trouble, although several of the officers were at their cars going though papers or something. A helicopter from Northwest Cable News was hovering overhead by this time as well.
However, I couldn't find any mention of the incident on the 911 dispatch page, nor was it revealed on any of the news websites I checked. Google brought me dozens of reports of the day prior, when police were apparently chasing a bank robber around West Seattle for a fair chunk of the day, but nothing current to yesterday afternoon.
Bomb threat? Hazmat issue? Like I said, no suits and no urgency to the situation, which seems to belie either of those situations. Strange.