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SEATTLE -- A semi truck tumbled off Interstate 5 at Ravenna Monday, crashing onto the on-ramp below. Four people were injured in the crash.

It happened around 11:00 a.m. in the southbound lanes of I-5 as the semi truck and a Ford Mustang were approaching the Ravenna Boulevard exit.

According to Washington State Patrol troopers, the 19-year-old woman driving the Mustang lost control, crossing all four lanes of traffic, and hit the semi.

The semi veered left and drove over the freeway barrier, crashing down onto the Ravenna on-ramp below, landing upside down.

The driver of the semi, a 61-year-old Maple Falls man, received minor injuries. He and the 19-year-old woman, as well as her two passengers, were all taken to Harborview Medical Center.

A Seattle Parks and Recreation crew witnessed the crash while working along Ravenna Boulevard and rushed over to the scene to help. The workers blocked the ramp to I-5 with their truck, called 911 and directed traffic before emergency vehicles arrived on scene.

The official cause of the crash remains under investigation. Any potential charges are pending.

All lanes of I-5 southbound reopened about two hours after the crash. However, the on-ramp from Ravenna to I-5 southbound remains closed.

A long line of backed-up traffic developed as soon as the crash happened.

The semi truck was reportedly transporting eggs.

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