PORT ST. LUCIE — A house fire has displaced a family from its home on Penrose Avenue.

St. Lucie County Fire District crews were called to the fire shortly before 2 p.m. on Tuesday. When they got to the house in the 1700 block of Penrose, the flames had spread to roughly half the house, district spokeswoman Catherine Chaney said. Chaney said firefighters had the blaze under control by 2:22 p.m.

The fire started in the back porch, reached the roof and then spread throughout the house, Chaney said. No one was home during the blaze, which also spread to a wooded lot next door.

The Red Cross is helping the family find temporary shelter. The cause of the fire is unknown.