Apartment Building, Residential Portland, OR – Mattress fire at downtown apartment held in check by sprinkler system March 25, 2017 viking210 Firefighters are working to put out a mattress fire Thursday morning inside a building in Northwest Portland. Reports came in just before 10 a.m. of a fire on NW 6th and Flanders Street. Portland Fire & Rescue said the flames were kept in check by the building’s sprinkler system. Arriving crews searched the unit for people, but initial reports state that the area was clear. A fire crew is working to “salvage” the unit, or try and prevent any further smoke and sprinkler damage.