Federal agents seized computers from a Northeast Portland man's house this week as part of in investigation into his alleged threats against controversial Arizona sheriff Joe Arpaio.

FBI agents searched the house of Clifton Dawayne Brooks in the 6500 block of Northeast Prescott Street at 6 a.m. Monday.

According to an

for the house, agents conducted the Portland raid after Brooks allegedly threatened Arpaio on the now-defunct website targetingcops.com last month.

Sheriff's officials said at one point during the raid, officials cleared the area when they found what appeared to be a bomb in the home; it was later found to be a prop. At least eight people were living in the home during the raid.

Officials became aware of the threats last month when someone posted a gruesome depiction of the shooting death of Maricopa County Sheriff's Deputy William Coleman. The blogger called the alleged shooter, 30-year-old Ryan Maras, a "hero" and a "citizen martyr."

According to the affidavit, the blogger then also posted a photo of Sheriff Arpaio with the words, "Wanted: Dead or Alive."

The affidavit says that agents eventually traced an IP address to a computer at Brooks' home at the Northeast Portland address.

Arpaio, 79, was elected Maricopa County sheriff in 1993. His tough stances on illegal immigrants and inmates in his jail have made him a flashpoint on both issues.

Last December, Arpaio was rebuked by the U.S. Department of Justice for his office's pattern of racial profiling, including the unlawful stops, detainment and arrests of Latinos.

also concluded that Arpaio’s deputies, command staff and supervisors also unlawfully retaliated against people who complained about the department’s policies.

Shortly after the report was issued, 92 of the sheriff’s immigration jail officers lost the federal power to check an inmates immigration status, and his office lost hits power to enforce immigration laws in Phoenix. Arpaio is contesting that decision in federal court.

On Tuesday, the sheriff defended his investigation into President Obama's birth certificate, saying at a news conference that he took on the task to "possibly be able to clear the president."

Arpaio promised to release the results of his investigation on March 1.

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