Story highlights At least three people were killed, Pennsylvania State Police say

Highway patrol says 60 vehicles involved

Witness "couldn't believe what I was seeing. It was carnage."

(CNN) At least three people were killed and scores were injured when dozens of vehicles slammed into each other on a stretch of Pennsylvania interstate in Lebanon County, officials said.

A driver involved told CNN the weather on Interstate 78 near Fredericksburg was a prime factor.

"It was definitely a whiteout, I couldn't see any further than probably two city blocks," Raoul Jardine of Allentown said. "I saw brake lights and pulled off to the side. Somebody hit me when I was parked in the shoulder."

"We are still in the process of looking for people in vehicles so I cannot say how many are dead yet," Pennsylvania State Police spokesman Trooper David Beohm said.

At least 60 vehicles were involved in the series of wrecks.

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