Allen Ivanov, 19, was arrested about 90 minutes after the shooting that killed three and severely injured another.

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The Washington State Patrol has released patrol-car video of the arrest of accused Mukilteo gunman Allen Ivanov, who was taken into custody on Interstate 5 near Chehalis about 90 minutes after Saturday’s shooting.

Ivanov, 19, was charged this week with three counts of aggravated first-degree murder and one count each of attempted first-degree murder and first-degree assault.

He is accused of gunning down his ex-girlfriend, Anna Bui, and two other former high-school classmates, Jake Long and Jordan Ebner, at a house party in Mukilteo early Saturday.

The three 19-year-olds died at the scene and Will Kramer, 18, was severely wounded.