At 3am a report of a big rig and a small sedan crashed on the southbound 5 at Euclid. When units arrived on scene they found a big rig on its side in the HOV lane and a small sedan with heavy damage. Fire crews tried to save the patient inside the sedan but unfortunately they expired on scene. CHP and OC Coroner are on scene investigating. The 5 freeway is being diverted off at Euclid St off-ramp and the freeway is expected to be closed until the investigation is complete.