A one-and-a-half year old child was killed and her four-month old sister was in critical condition after a family of six was exposed to a poisonous substance in their home in Jerusalem's Giv'at Mordechai neighborhood on Wednesday.

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Two parents in their thirties, as well as two additional small children were treated on the scene by paramedics after being lightly affected by the substance, believed to be a result of pest extermination spraying.

Police said that they were checking the connection between the pest extermination spraying and the family's poisoning and had detained the exterminator for questioning.

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