FREDERICKSBURG, Pennsylvania (AP) — Authorities say more than 70 people were treated following the huge pileup on a central Pennsylvania interstate highway that killed three people.

Trooper Justin Summa of the state police barracks in Lebanon County said Sunday that names of the three people who died would be released later in the day.

He said Saturday's crash on Interstate 78 during a snow squall involved 64 vehicles, including a dozen commercial vehicles such as tractor-trailers and box trucks.

At least one person remains in critical condition with injuries from the crash. Penn State Hershey Medical Center said two others taken to the hospital with critical injuries had improved.

The interstate highway reopened Saturday morning.

Trooper Adam Reed said investigators believe that "passing snow squalls played a role in causing the crash."