The driver's mother said he got his license two months ago and sneaked out of the house the night of the crash to drive around with his friends. All three teens who died were students at Henry M. Jackson High School in Mill Creek.

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The three high-school students killed in an early morning crash in Lynnwood on Wednesday have been identified by the Snohomish County Medical Examiner’s Office.

The victims are Landon M. Staley, 16, of Everett; Travin K. Nelson-Phongphiou, 16, of Everett; and Mikayla Sorenson, 15, of Bothell. The cause of death for each was listed as multiple blunt-force injuries, the medical examiner’s office said.

All three students attended Henry M. Jackson High School in Mill Creek.

A 15-year-old girl who was injured in the crash is a student at Cascade High School in Everett, according to the Everett School District. On Thursday, she was in serious condition in the intensive-care unit at Harborview Medical Center in Seattle.

Cari Staley, Landon Staley’s mother, told KOMO that her son was the driver.

He got his driver’s license two months ago and sneaked out of the house the night of the crash to drive around with his friends, something he’d never done before, she told KOMO.

“We talked about rules and boundaries and why and reasons,” she said.

Court records show Landon Staley, who turned 16 on June 1 and had an intermediate driver’s license, was pulled over July 2 for speeding.

Under state law, drivers under 18 with an intermediate license are not to drive with passengers under age 20 who are not immediate family members for the first six months.

The four teens were driving north in a Kia Sorrento in the 16900 block of Alderwood Mall Parkway around 4 a.m. Wednesday when their vehicle struck the trailer of a parked semitruck and drove underneath it, said a Snohomish County Sheriff’s Office spokeswoman.

While it is legal for trucks to park trailers in designated areas along Alderwood Mall Parkway, the involved semi was not parked in the correct direction. Instead, the front of the trailer faced oncoming traffic, a sheriff’s spokeswoman said. The violation is a civil parking infraction.

Dave Peters, principal of Henry M. Jackson High School, sent a letter to students and their families to notify them of the crash and offer counseling services.

In a Thursday email message to families, Peters said about 100 people showed up at the school to receive support.

Staley and Nelson-Phongphiou had completed 10th grade while Sorenson had completed 9th grade, according to Peters’ email.

School officials are “planning ways to honor these students as school begins and to use a positive message to bring our Jackson community closer together through this tragedy,” Peters wrote.