A subject believed to be connected to suspicious letters sent to President Donald Trump and top Pentagon officials was taken into custody by federal law enforcement in Utah, a federal law enforcement official told CNN on Wednesday.

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LOGAN, Utah -- Authorities say a Utah man has been arrested in connection with suspicious envelopes sent to President Donald Trump and others.

A spokeswoman for the U.S. attorney for Utah said Wednesday that 39-year-old William Clyde Allen III was taken into custody Wednesday in Logan, a small city in northern Utah.

Pentagon authorities say two envelopes were addressed to top military chiefs containing the substance from which the poison ricin is derived.

On Tuesday, Pentagon officials said two envelopes that had been suspected of containing ricin were isolated at a Pentagon mail screening facility, then sent to the FBI. They said one envelope was addressed to Mattis, the other to the chief of the U.S. Navy, Adm. John Richardson. No one was injured.

According to the Centers for Disease Control and Prevention, if castor seeds are swallowed the released ricin can cause injury.

Another envelope was sent to the president with unknown contents. The Secret Service says it didn't reach the White House.

A Pentagon spokeswoman says the envelopes addressed to Defense Secretary Jim Mattis and the Navy's top officer, Adm. John Richardson, contained castor seeds. They were isolated at a mail screening facility and sent to the FBI.

No attorney was immediately listed for Allen.

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