At least 11 people started feeling ill Tuesday after a letter was opened in an administrative building on Joint Base Myer-Henderson Hall in Virginia.

The letter was received on the Marine Corps side of the base.

Three people were taken to the hospital for evaluation but were released at 10 p.m. Tuesday, according to a command release.

Officials did not immediately identify what, if any, substance was in the letter. The FBI and NCIS are investigating the incident.

Joint Base Myer-Henderson Hall, just outside Washington, D.C., is the closest installation to the Pentagon and is home to units such as the Army’s 3rd Infantry Regiment, or the Old Guard. It also is where many of the Army’s senior leaders live.

This is a developing story. It will be updated as we get more information.

Michelle Tan is the editor of Army Times and Air Force Times. She has covered the military for Military Times since 2005, and has embedded with U.S. troops in Iraq, Afghanistan, Kuwait, Haiti, Gabon and the Horn of Africa.

Shawn Snow is the senior reporter for Marine Corps Times and a Marine Corps veteran.

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