SALISBURY TOWNSHIP, Pennsylvania (WPVI) -- Six children and two adults were taken to the hospital after falling ill at the Lehigh Christian Academy in Salisbury Township.
Officials still don't know what made them sick.
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Police say that initial air quality checks were performed with no obvious levels that would cause concern.
A similar incident happened last October when kids were evacuated due to a possible contaminant leak in the building.
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In that case, the unknown odor was believed to be from an HVAC system.