Original story follows.
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California Highway Patrol officers are investigating after two people were killed and one other was critically injured in a crash in Tulare County on Tuesday morning.
Witnesses told the CHP that a 2010 Prius was driving erratically on Road 80 while traveling south toward Visalia.
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Officers say other drivers slowed as the Prius weaved through traffic to pass cars, reaching speeds up to 100 miles per hour.
As the 20-year-old driver of the Prius reached the intersection on Avenue 328, he crashed into the back of a commercial farming truck.
A 17-year-old girl in the backseat of the Prius died at the scene, officials say. She wasn't wearing a seatbelt.
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The 20-year-old driver and a 16-year-old passenger were rushed to Kaweah Delta Medical Center with critical injuries. CHP officers say the driver later died at the hospital.
Investigators found a loaded gun inside the car and marijuana plants spread across the crash site.
The cause of the crash is still under investigation.
This is a developing story. Stay with Action News for updates.