WASHINGTON -- The U.S. Capitol Police said it found no hazardous materials after investigating a "suspicious" powder that came in the mail Monday to the office of Rep. Gregory Meeks (D-Queens).

"The U.S. Capitol Police have cleared the incident in Room 2234 of the Rayburn House Office Building," the police said in an email to members of Congress. "All test results were negative. The area has reopened."

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Police were called to Meeks' office earlier Monday after a staff member discovered powder after opening a piece of mail.

Neither the Capitol police nor Meeks' office identified the substance.

Meeks, who is in New York City, had no comment.

The investigation comes after letters with the hazardous substance ricin were sent on April 15 to President Barack Obama, Sen. Roger Wicker (R-Miss.) and a Mississippi State judge.