BRENTWOOD (CBS SF) — A man is in custody on suspicion of driving under the influence of alcohol following a crash that left a teenager injured in Brentwood on Tuesday afternoon, police said.

Officers arrived to the scene of a vehicle vs. pedestrian collision around 3:27 p.m. at Brentwood Blvd. and Fir St. The crash caused the roadway to be closed for nearly two hours.

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Investigation revealed that the 14-year-old victim was walking along the shoulder of Brentwood Blvd. when he began suffering a medical emergency. The victim began moving into the southbound lane of Brentwood Blvd., where he was struck by a Ford F250 truck.

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The victim’s injuries at the scene were moderate, police said, but he was flown to Oakland Children’s Hospital.

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The driver, a 58-year-old male from Brentwood, remained on the scene as police conducted a DUI investigation. He was taken into custody after authorities performed sobriety tests.