(CNN) -- A white substance mailed to a Florida congressman's campaign office on Friday was "not a dangerous material," emergency officials said.
"It came back as a non-biological threat," said Frank Correggio of Boca Raton Fire-Rescue, the team that responded to the report.
"We don't know what it is yet," Correggio said, "but we know it's not hazardous.
The FBI is leading the investigation into where the substance came from. The Joint Terrorism task force for South Florida is also on the case.
"I thoroughly condemn this act," West said. "I am deeply disturbed at this incident which threatened a member of our campaign staff."
The envelope contained a white powder and a letter that made derogatory statements toward West and mentioned the word "anthrax," a statement from West's office said.
It was picked up from a Post Office in Deerfield Beach, Florida, before it reached the West for Congress campaign office in Boca Raton, the statement said.
West, who has two congressional offices in Florida, said he and his staff are "taking the necessary precautions with regard to incoming mail."
No one was injured in the incident, officials said.
CNN's Rich Phillips contributed to this report