A three-vehicle crash Friday morning on southbound Interstate 205 blocked all lanes of the freeway for hours and sent a Washington State Patrol trooper to the hospital.

Trooper Will Finn tweeted that the crash was being investigated as a road rage incident.

An alert from the Washington State Department of Transportation stated that the crash occurred around 9:38 a.m. near the Fourth Plain Boulevard underpass.

Witnesses told troopers a vehicle passed on the right shoulder of the freeway while a trooper was conducting a traffic stop and struck the cruiser from behind, according to Finn. He said the trooper was OK but complained of neck pain and was driven to a hospital to be examined.

One of the three people injured in the crash had to be extricated from a vehicle, according to emergency radio traffic monitored at The Columbian.