(Photo tweeted by Seattle Fire Department)
FIRST REPORT, 12:08 PM: In case you saw the large contingent of fire/rescue vehicles headed onto Harbor Island: The “automobile rescue” call is at 1801 16th SW, which checks to Vigor Industrial. Early word from scanner traffic is that it involves a semi-truck that somehow “cantilevered onto its back wheels” and is pointing vertically into the air, but no one is hurt and crews are focused on securing the truck until it can be dealt with. Some of the responding crews have been canceled.

1:35 PM UPDATE: Thanks to Vigor spokesperson Athena Maris for this update:

Vigor is in the process of decommissioning one of its dry-docks. A contractor assigned to the project was carrying scrap material in his truck up a ramp when the truck flipped upward onto its back wheels. The driver has been safely removed and is on his way to the hospital. While the extent of his injuries is unknown, at this point he does not appear to be seriously injured. Fire & Rescue is departing the scene which has been stabilized. Once the truck has been removed, we will begin a full investigation of the incident.