FBI Arrest Oregon Man Charged with Threatening President, Find Pipe Bombs

John Martin Roos, 61, was the subject of a search warrant.

In a statement, the FBI said, "At approximately noon on Thursday, April 28, 2016, FBI Agents and Medford Police Officers served a federal search warrant at an apartment on Poplar Drive in Medford. Inside, they found what appeared to be several pipe bombs. The Oregon State Police Explosives Unit responded, and members of that unit have rendered the devices safe."

Roos is currently housed in the Jackson County Jail. Roos will likely make an initial appearance before a U.S. Magistrate Judge on in the next few days, the FBI said.

ABC News' Benjamin Stein contributed to this report.