Update | 8:26 p.m.
KTOO’s Matt Miller shot this raw video from the scene earlier today.
Update | 8:20 p.m.
Capital City Fire/Rescue Assistant Chief Ed Quinto says firefighters went through the building and found evidence of squatting, but nobody inside.
Update | 7:56 p.m.
Building owner James Barrett says he has no idea what caused the fire. He says the building was secure.
Update | 7:37 p.m.
The fire is out, says Tom Mattice, emergency programs manager for the City & Borough of Juneau.
Original post | 7:31 p.m.
The condemned Gastineau Apartments building in downtown Juneau caught fire again this evening.
Flames inside the building and a gray smoke plume were visible as firefighters responded around 7 p.m. By about 7:20, the blaze appeared to be under control.
— Matt Miller (@KTOOMatt) March 22, 2015
This is a developing story. Check back for updates.