NEW YORK (CBSNewYork) — Police are investigating after suspicious packages were mailed to five Manhattan schools.

The packages were delivered between March 10-18.

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According to police, each of the five schools received a plain white envelope containing a white powdery substance.

Authorities screened the contents of the envelopes, and they were determined to be non-hazardous.

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Police believe the packages are being sent to “cause disruption and alarm.”

No arrests have been made.

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Anyone with information regarding these incidents should contact the NYC Terrorism Hotline at 888-NYC-SAFE.

CBSNewYork Team