Correction: This article originally named the wrong hospital where those injured in the crash were taken.
A chain of four vehicles hit each other as traffic slowed on Interstate 84 shortly before 7:30 a.m. Monday, according to Idaho State Police.
ISP says the crash at milepost 33, near Nampa, unfolded like this:
Andrea Shepherd, 26, of Twin Falls, was headed east in a 1999 Subaru Legacy when she failed to yield to slowed traffic and hit a 2007 Jeep Wrangler. The driver of the Wrangler, 35-year-old Thad Harris of Caldwell, swerved and his vehicle came to rest in the median.
Shepherd's Subaru then hit another car, a 2013 Chrysler 200 driven by Rebecca McNutt, 30, of Caldwell. The Chrysler collided with a 2007 Honda Accord driven by 62-year-old Randall Jensen of Ontario, Ore. The Accord ended up on the shoulder of the median.
Shepherd and her Subaru stopped in I-84's left lane, ISP reported.
The left lane was blocked for about an hour while crews cleared the highway.
Shepherd and McNutt were both taken to Saint Alphonsus' Nampa Health Plaza. Both of them had been treated and released by 3:30 p.m. Monday.
Shepherd was cited for inattentive/careless driving.
ISP continues to investigate the crash.