All the victims were inside the bus at the time of the accident, a fire service spokesman told AFP.
The bus driver is in a "life-threatening" situation, with two other passengers seriously injured and six lightly injured, he said.
Five people were taken to hospital for treatment.
The bus driver was "the last who was freed as he was stuck" in the wreckage, the spokesman said.
The accident took place in an industrial area of the port city.
Police said in a statement that it happened at an open level crossing, adding that "the cause of the crash is not yet clear".
The person who died "succumbed to their injuries at the scene", the police said.
Alongside emergency services, criminal police were also dispatched to the scene to aid in the investigation.
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