The vans were driving south side by side on U.S. 101 near Bradley in Monterey County when they crashed into each other around 12:30 p.m., Officer Joel Newby said.
The collision sent one van into the center divide, where it rolled over. Two students were ejected through a broken window. The CHP initially said the two students were seriously injured but later described their injuries as moderate.
The two students were taken by helicopter to trauma centers. Two other students were taken by ambulance to local hospitals, also suffering from moderate injuries.
The remaining injured students suffered minor injuries that didn't require medical treatment, the CHP said.
The students, undergraduates from the university's Foster School of Business, belonged to an organization that connects American students with internships abroad, as well as foreign students with internships in the U.S., university spokesman Bob Roseth said.
In all, there were three vans transporting 33 Washington students to the organization's regional conference in Santa Maria. The cause of the accident was under investigation.
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