9:01 AM: We’re receiving multiple reports that the “low bridge” is closed to car traffic, with police presence. We don’t yet know why but are on the way to find out. (Thanks to Bill for the original tip – he says he did get through via bicycle.)

9:23 AM UPDATE: We’re at the low bridge and can confirm, it’s closed to cars. One officer says it should reopen within the next 45 minutes or so. If you approach from the West Seattle side, you’ll be detoured onto Harbor Island. Police at the scene will only say this is “part of an ongoing investigation” – they are clearly looking for evidence of some kind; we’ll keep checking for details.

3:29 PM UPDATE: Still no additional information available, except that it was indeed the CSI team, following up on “an investigation,” and no one can say so far whether the investigation even relates to a West Seattle case. (And yes, the bridge has long since reopened.)