Updated 2 p.m.: Firefighters were dispatched to a vacant three-story apartment building on NW 63rd St. near 15th Ave. NW just before 7:30 this morning. When fire crews arrived, they reported smoke and flames from a room on the top floor.

Crews had difficulty accessing the fire due to a large amount of debris on the stairway and on the second floor. A neighbor says the building is vacant and the owners have been cleaning it out.

Investigators say the fire this morning was accidental and caused by spontaneous combustion of organic debris. Damage estimate is $40,000.