A FedEx truck crossed a median and slammed head-on into a bus carrying students in Northern California on Thursday night, killing 10 people.
The collision killed both drivers, five students and three chaperones.
At least 31 people were taken to local hospitals.
The reason the FedEx truck crossed the median remains under investigation, a probe that could take months.
The bus was taking students from various Los Angeles-area schools to visit Humboldt State University in Arcata. The collision occurred in Orland, about 100 miles north of Sacramento.
One of the survivors chronicled his experience through Twitter. "i was asleep and next thing you know i was jumping out for my life," Jonathan Gutierrez wrote, saying he couldn't believe what just happened.
The Sacramento County Coroner's Office identified one of the adult victims as Arthur Arzola, an admissions counselor at Humboldt. The 26-year-old was based in the Los Angeles area and considered the university like family, according to his profile on the school's website.
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Craig Mason of Los Osos hadn't heard from his brother for days when he finally received a text Wednesday. He thought his brother was fishing with friends in Baja California when he learned that Hurricane Odile had wreaked havoc in the Mexican resort.