9:57 AM: Thanks for the tip. Seattle Fire has responded to a natural-gas leak in the 5200 block of Delridge Way SW, and that has the southbound side of the street closed between Brandon and Puget. Updates to come.
10 AM: According to SFD radio communication, this happened because of a sewer-line repair.
10:06 AM: SFD describes this as a “minor leak,” because of a “nicked” line. They’ve been checking the air in neighboring houses for safety’s sake.
10:38 AM: SFD reports that Puget Sound Energy has “secured the leak,” so its units will be leaving, which means the road should be reopening.