RANDOLPH, MASS. (WHDH) - A teacher in Randolph was taken to the hospital Tuesday afternoon after an unknown type of tablet was found in the teacher’s cup of coffee, police said. 

This incident took place at Donovan Elementary School. The teacher went to the hospital as a precaution, according to officials. Police did not say whether the teacher suffered any symptoms. 

Police told 7NEWS they are assisting school administrators investigating this incident, though they said this is not a criminal investigation.

Investigators have confirmed this incident took place in the same fourth grade classroom where shell casings were found last month. 

In emails to staff and parents obtained by 7NEWS, the Donovan School’s principal said the teacher involved in this incident found the unknown substance in their coffee around noon on Tuesday.

The principal also made reference to incidents in January, saying officials had determined that five students had “some level of involvement in the notes and empty shell casings that were found in the schools.”

According to the principal, all five students have received some form of punishment. 

A search using police dogs after shell casings were found did not turn up any other casings or weapons. The shell casings did prompt a school lockdown, though, as well as concern from parents, who met with the Randolph Public Schools superintendent and a school resource officer at a subsequent safety forum.

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