About 200 firefighters responded and were struggling to subdue the fire around noon, as white smoke poured from the windows.
Japanese firefighters struggled for 11 hours to put out the fire.
The neighbors evacuated the building, and firefighters broke windows and struggled with a lock on the apartment's door.
By early this morning, firefighters were still struggling to control the blaze, which had engulfed the building's fifth and fourth floors.
Discovering the now highly unstable bomb on board, firefighters struggle to put out the fire at the crash site.
Nearly 3,200 firefighters, aided by 16 helicopters and 10 airplanes, struggled to contain the blaze, which broke out on Sunday.
Dozens of American soldiers surrounded the wreckage as firefighters struggled to put out the flames.
Elsewhere in the West, firefighters struggled to consolidate gains made with the help of cooler weather.
For the next six hours, guards and firefighters struggled to restore order and extinguish the fires.
And well past midnight, firefighters struggled to reach some more people pinned in the basement of the north tower.