Derailment of a train carrying ammonia, Serbia 51 people were poisoned in the southeast on Sunday, officials said.
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The ammonia leak caused 51 cases of poisoning in Pirot, announced the mayor of Pirot, Vladan Vasic.
In Pirot, the neighborhood where the accident took place, a state of emergency has been declared and the authorities have asked residents to stay indoors.
The train, which had 20 carriages, was carrying toxic substances from Bulgariaofficials revealed.
