Hundreds marched across the Brooklyn Bridge in New York City in a massive show of mourning for Floyd, who died May 25 while in Minneapolis police custody.
The ship, which was near Jacksonville, was scheduled to leave the area when the explosion occurred.
The altercation on the Capital Crescent Trail in Bethesda was caught on video.
Organizers of the LA Pride Festival and New York's Queer Liberation March announced their respective events will this year be dedicated to black solidarity.
Video shows a man speeding after a group of young protesters in his SUV, then rushing them with blades strapped to his arm.