CALN TWP., Pennsylvania (WPVI) -- Hazmat crews were called to a mail mystery in Chester County, Pennsylvania.
It happened just after 7:30 p.m. Tuesday on the unit block of Nancy Lane in Caln Township.
According to authorities, three people reported feeling light-headed and dizzy after opening their mail.
The three were checked out at the scene and did not require hospitalization.
The investigation remains ongoing.
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