A dozen people breached the construction site for the King County youth detention facility.
Radiant heat damaged a ladder truck and an ambulance.
The car swerves around the other vehicles and slams into the two protesters, sending them flying into the air.
Seattle police showed up in force early Wednesday at the city's “occupied” protest zone, tore down demonstrators' tents and used bicycles to herd the protesters after the mayor ordered the area cleared following two fatal shootings in less than two weeks.
The Seattle Fire Department responded to criticism of their response to a fatal shooting in the protest zone.
Mayor Jenny Durkan said the violence was distracting from changes sought by thousands of peaceful protesters opposing racial inequity and police brutality.
The CHOP zone is a several-block area cordoned off by protesters near a police station in the city's Capitol Hill neighborhood.
Two males with gunshot wounds arrived in private vehicles at Harborview Medical Center about 3 a.m.
Tense protests over the death of George Floyd and other police killings of black men grew Saturday from New York to Tulsa to Los Angeles, with police cars set ablaze and reports of injuries mounting on all sides.
One person was injured in a Seattle house fire on Monday evening.