Darryl Webb / Reuters, file
Maricopa County Sheriff Joe Arpaio was re-elected for his sixth term in November.
An explosive device sent to "America's toughest sheriff" was intercepted by police in Arizona on Thursday, officials said.
A suspicious package addressed to Maricopa County Sheriff Joe Arpaio's downtown Phoenix headquarters was X-rayed by officers in Flagstaff, Ariz., according to authorities.
A bomb team later destroyed the device.
The FBI, U.S. Postal Inspection Service and Flagstaff Police were investigating.
Arpaio, 80, has earned headlines nationwide as a result of his tent city jail and immigration roundups.
The controversial lawman was re-elected for his sixth term in November.
Reuters contributed to this report.