5:35 AM: Thanks for the tips. The helicopter you might have heard over White Center/South Delridge was TV, checking out a fire call on 16th in downtown WC, just south of Roxbury. West Seattle fire units were dispatched for mutual aid for a while. We have a crew checking it out.
5:52 AM: What caught fire was a refrigerated truck trailer parked by a building at 15th/SW 98th that firefighters also say sustained damage. No injuries. Power’s out because lines were involved. (The TV helicopter has long since moved on to something else elsewhere in the region.)
6:13 AM: Added photos. Metro says buses that use 15th SW in the area might be affected; fire trucks were still blocking that street when we left a few minutes ago – we’ll be going back after sunrise for a closer look.
9:58 AM: The investigation continues:
In the photo above, you can see the blackened area where the fire spread to the building by which the trailer was parked.