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Four people safely escaped a trailer fire early Thursday morning in South Haven Township.

The fire broke out at 21980 M-140 Highway around 4:08 a.m., according to officials. Firefighters from South Haven Area Emergency Services, Covert Township, and Bangor Community responded.

The trailer was fully engulfed when crews arrived, but all occupants had evacuated. Firefighters contained the blaze, preventing damage to a nearby unoccupied trailer.

Investigators say the most severe damage appears to be near a floor electric heater, though the exact cause remains under investigation.