OAKLAND (CBS SF) — A firefighter was injured and 17 people were displaced in a two-alarm structure fire in Oakland’s Fruitvale district early Thursday morning, a fire spokesman said.

Fire officials said the blaze was first reported just before 4 a.m. in the area of the intersection of 34th Avenue and Foothill Boulevard. Crews arriving on the scene encountered massive flames and heavy smoke billowing out of a structure and called in a second alarm.

Oakland Firefighters Photo

Fire spokesman Michael Hunt said firefighters who responded to the blaze saw that it was spreading to buildings on each side of the vacant home so they requested a second alarm.

One of the adjacent buildings is a single-family residence and the other is a multi-unit structure.

The fire was declared under control at 4:30 a.m. but one firefighter was injured and 15 adults and 2 children were displaced, according to Hunt.

The American Red Cross has been contacted to arrange housing for the people who were displaced, Hunt said.

The fire rekindled at 7:57 a.m. but was quickly controlled, according to Hunt.

Fire officials asked for a structural engineer to examine the vacant house where the blaze originated and the house has been red-tagged, Hunt said.

The cause of the fire is under investigation.