HARWICH (CBS) — A serious four-car crash backed up traffic in Harwich mid-morning on Wednesday. Route 6 by Exit 10 was closed by Mass. State Police around 10:30 a.m., it has since reopened.

Three people needed to be transported to the hospital, the Harwich Fire Department said, and two were med-flighted to Boston. They did not say the extent of the injuries.

First responders at the scene of a four-car crash in Harwich (Photo Courtesy: Mass. State Police)

It appears two mini-vans collided head-on.

No word yet on what caused the crash. State Police have not released any more information at this time.