Fire at United Airlines maintenance yard at SFO

SAN FRANCISCO (KTVU) - A two-alarm fire broke out Wednesday morning at the United Airlines' maintenance facility north of the terminals at San Francisco International Airport, a spokesman said.

Airport spokesman Doug Yakel said that passenger terminals and flights were not affected.

Smoke was first seen about 7:30 a.m. 

Yakel said the fire was put out by 8:20 a.m.

No injuries were reported. 

The cause of the fire is under investigation.