A gunman shot and killed a person inside Vida Gymnasium, according to multiple police sources.
The shooter then left the gym and continued shooting outside, including in a parking lot, the sources said.
The suspect, a heavy-set white man, is now barricaded in a building, according to sources.
There is a heavy law enforcement presence around the gym, with assistance from the US Park Service, DC Metropolitan Police Department, FBI, ATF and US Marshals Service.
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