By WILLIAM MANSELL, ABC NEWS(SEATTLE) — One person has life-threatening injuries and another is in serious condition after a vehicle drove through protesters walking on a closed interstate in Washington state overnight, according to Washington State Patrol.The vehicle, according to Washington Patrol PIO Rick Johnson, drove through a closure along I-5 and struck multiple people on the freeway.Authorities stopped the vehicle and the suspect is in custody.Interstate 5 between SR 520 and I-90 was closed multiple times in the last 24 hours due to protests.Authorities are holding a press conference at 4 a.m. local time to provide updates.This is a developing story. Please check back for updates.Copyright © 2020, ABC Audio. All rights reserved.