CNN:

CNN) - (CNN) -- One year after an unarmed 25-year-old motorist was fatally shot by US Park Police, his family, friends and supporters plan to gather in front of the Lincoln Memorial to demand answers. "We have so much anger and we're fighting so hard and we have so much pain that we don't even have a minute to process or mourn," said Negeen Ghaisar, the older sister of Bijan Ghaisar.

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