The white powder sent in a letter to the Jewish community center in Boulder, Colorado, was “benign” and not harmful to humans, the sheriff’s office determined.

The JCC evacuated its building after an employee received the threatening letter. The sheriff’s office said the letter, opened on April 6, said “your [sic] have enemies,” several local media outlets reported.

Employees who came into contact with the letter had been put under quarantine. The local health department, fire department and Hazmat team responded.

A Boulder synagogue, Congregation Har HaShem, reported that it received a similar letter on April 6. — jta