4:55 AM: Seattle Fire has sent a sizable response to what they’re describing as a “residential fire” in the 4500 block of 36th SW [vicinity map]. Updates to come.

5:15 AM: Some responders are being dismissed, so this is winding down.

5:30 AM: SFD says the fire was in “a detached shed” and quickly controlled; no injuries reported.

MONDAY UPDATE: SFD says the fire was ruled of “undetermined” origin.