DOVER — Law enforcement is in possession of a letter with a "suspicious brown substance" that was delivered to the Dover office of U.S. Rep. Carol Shea-Porter, D-N.H., on Monday afternoon.

Dover police said no one was injured or sickened and that officials at the Congresswoman's office handled the envelope appropriately. Dover police said they are working on the investigation with the U.S. Capitol Police, a federal law-enforcement agency charged with protecting the members of Congress within Washington, D.C., and throughout the country.

Patrick Carroll, district director for Shea-Porter, said the envelope arrived around 1 p.m. via the U.S. Postal Service. He said the office followed protocol, but did not provide further details. He said Dover police were notified and were handling the investigation. He declined to identify the size of the envelope.

In a statement released later on Monday, Shea-Porter said, “This afternoon, my New Hampshire office received an envelope with an unidentified brown substance inside. My office followed House procedure and notified the appropriate law enforcement agencies, and we are waiting for the results of some testing. I am so grateful for the quick response of the Dover Police department.”

Due to the ongoing nature of the investigation, limited details are being released, said police.

Anyone with information about these incidents is asked to call the Dover Police Department at (603) 742-4646. Anonymous tips may be called into the Dover Crimeline at (603) 749-6000. The Dover Crimeline can also be contacted via www.dovernhcrimeline.org.