GLENDORA (CBS) — An accident involving a Wal-mart big rig and several cars closed a portion of the westbound 210 Freeway Friday morning.

The accident happened just before 5 a.m., east of Grand Ave. Los Angeles fire officials say the big rig collided with three vehicles, seriously injuring at least one person.

Officials say two people were taken by helicopter to County USC Hospital; another person was transported to a Foothill area hospital. Their conditions have not been released.

All lanes on the 210 Freeway were reopened at 6:52 a.m. after a Sig Alert was canceled.

Cause of the Big-Rig Accident: The California Highway Patrol has begun their Investigation. Based on news reports, the big-rig driver lost control for unknown reasons. It is also possible that the driver of the big-rig was partially responsible for the collision. The CHP will undoubtedly investigate if other factors, such as road conditions or negligent vehicle maintenance were factors in the crash.

Truck Accidents and Wrongful Death Liability Considerations: After a big-rig crash, trucking companies waste no time in having their own investigators determine what happened, to protect them as much as possible. The family members of the victims should contact a skilled California truck accident attorney as soon as possible, who can arrange to have the accident scene inspected (while skid marks and other evidence is still present), and contact witnesses while recollections are still fresh. Because of Federal Motor Carrier Safety Administration (FMCSA) regulations governing the tucking industry, truck accident cases  are challenging and complex and from a legal standpoint, truck accidents are very different than car accidents. Choosing an attorney, such as, Gary A. Kessler who has successfully won cases against trucking companies is imperative to a successful outcome for the victim’s family.