MODESTO (CBS13) – Investigators are looking into what caused flames to break out at a homeless encampment in Modesto early Friday morning.

It happened around 3 a.m. at the temporary housing site underneath the 9th Street bridge, which was put in place earlier this year.

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When firefighters got to the scene, they found that several tents were on fire. Firefighters quickly went to work, but a total of five tents were eventually burned, including three that were a total loss.

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The cause of the fire is unknown.

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No one was injured in the incident.