A 69-year-old man with Alzheimer’s disease died in a fire that hit a residential area in the Philippine capital, the Bureau of Fire Protection said on Thursday.

The bureau said that the fire, which broke out around 5:30 p.m. local time in a district in Manila City on Wednesday, quickly swept across at least 20 houses, displacing 50 families of 200 residents.

The bureau added that it took the firefighters nearly an hour to bring the fire under control.

Arson investigators are still trying to get the cause and origin of the fire.