Protesters from Amnesty International and other groups gather in Lafayette Square for a rally and march Wednesday to mark the 10th anniversary of detainees arriving at Guantanamo. (Michael D. Bolden/The Washington Post)

2:50 p.m. Update: Staff writer Katherine Driessen is providing live coverage of the march and protests here.

1:25 p.m. Update: Police report that the marchers have started down Pennsylvania Avenue. Be alert for delays. At last report they were at Ninth Street and Pennsylvania.

Original post: A march down Pennsylvania Avenue is expected to delay traffic for drivers in downtown Washington Wednesday afternoon.

Amnesty International and other groups are holding demonstrations to mark the 10th anniversary of the arrival of detainees at Guantanamo Bay.

A rally is scheduled to begin at noon at Lafayette Square. Demonstrators then plan to march down Pennsylvania Avenue to protest at the Department of Justice, the Capitol Building and the Supreme Court beginning at 1 p.m.

Organizers said in a statement that the march “will be led by 171 people in orange jumpsuits and black hoods, representing the men still detained at Guantanamo.”

Traffic and the march may be affected by rain that is expected to push through the area. The Capital Weather Gang says showers may arrive in D.C. around noon. The rain is expected to last throughout the day, affecting afternoon traffic and the evening commute.

Other events are scheduled for other cities, including Paris, London, Brussels and Berlin.

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