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(CNN) — A suspicious package has been removed form the Hart Senate Office Building and suspicious envelopes have been removed from the third floors of both the Hart and Russell Senate Office Buildings, and the areas are now open, Capitol police said Tuesday.

The man carrying a bag of letters who is being questioned by Capitol police is not believed to be connected to a letter possibly containing ricin found in a Senate mailroom and an apparently similar letter sent to President Obama, a federal law enforcement official told CNN. The man being questioned is described as emotionally disturbed, the official said.

U.S. Capitol Police began evacuating the first floor of a Senate office building on Wednesday because of this man. Security officers also cleared the hall outside the office of Sen. Richard Shelby, R-Alabama, in another Senate office building.

A letter addressed to President Barack Obama that contained a “suspicious substance” has been intercepted at the White House’s off-site mail facility, a Secret Service spokesman said Wednesday. The letter arrived Tuesday, the same day as an envelope addressed to a U.S. senator that initially tested positive for the deadly poison ricin.

Authorities are investigating a suspicious letter at the office of Sen. Carl Levin in Saginaw, Michigan. “Earlier today, a staffer at my Saginaw regional office received a suspicious-looking letter,” Levin said in a statement. “The letter was not opened, and the staffer followed the proper protocols for the situation, including alerting the authorities, who are now investigating. We do not know yet if the mail presented a threat.”

The FBI said Wednesday that “there is no indication” letters possibly tainted with ricin intercepted in Washington are connected to Monday’s terror attack at the Boston Marathon.

CNN’s Dana Bash and Rachel Streitfeld contributed to this report.

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