Indian River County deputies investigated a suspicious letter Tuesday that reportedly caused a school district employee to feel ill.
According to Indian River Fire, no chemicals were found in preliminary tests.
Sources told WPTV the letter, which likely contained a threat, was opened Tuesday morning, but Hazmat crews were not called to the scene until the evening to test the substance.
Indian River County detectives were at the building Thursday evening to begin their investigation.
The sheriff's office expects to release more information Wednesday.
@IRCSheriff ‘s Detectives are currently investigating a suspicious letter received @IRCSchools district office. Initial reports were that an employee felt ill after opening the letter. @indianriverfire indicates no chemicals found in preliminary tests. 1/2
— IRCSheriff (@IRCSheriff) February 27, 2018