SAN LEANDRO (CBS SF) — An overnight fire severely damaged a home in San Leandro and displaced the residents, fire officials said Wednesday.

The Alameda County Fire Department said the fire was reported at around 1 a.m. Wednesday on the 15500 block of Calgary Street. A fire department spokeswoman said it appeared to have started in a structure connected to the home.

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According to social media posts from the department, the fire also charred a neighbor’s house.

Three residents in the burned home were displaced but Red Cross services were declined, the fire department said.

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No residents or firefighters were hurt, the department said. The cause of the fire had not yet been determined as of Wednesday afternoon.