Firefighters have controlled a six-alarm fire at a machine shop in Redwood City this morning that spread to four nearby buildings and displaced 17 residents, a fire marshal said.
Firefighters responded to the blaze at 894 Douglas Ave. at about 5:50 a.m., according to a San Mateo County fire dispatcher.
FMW Machine Shop is located at that address.
Firefighters contained the fire as of about 9:15 a.m. and had it under control by 10:30 a.m., Redwood City Fire Marshal Jim Palisi said.
Before firefighters could contain the massive blaze, it spread to a nearby apartment building, causing "significant" damage, Palisi said.
The displaced residents who lived in the building are receiving aid from the American Red Cross, he said.
No injuries were reported, according to Palisi.
Damage to the machine shop was extensive, including the collapse of the building's roof, Palisi said.
The fire also spread to three nearby industrial businesses, he said.
All streets within a one-block radius of the fire remained closed to traffic late this morning, city spokeswoman Sheri Costa-Batis said.
The San Mateo County Health System advised residents to stay indoors during the blaze to avoid exposure to smoke.
An inspector from the Bay Area Air Quality Management District has also been at the scene of the fire for most of the morning to monitor the air quality in the area, district spokesman Tom Flannigan said.