An 18 car pileup left three people dead and several more injured during a snow squall on a highway in Pennsylvania on January 7. According to Fox News, the multi-car accident was a chain reaction that was caused by poor visibility on Interstate 80 in Clarion Township. Two of the people killed died after leaving their vehicles. One of those people was struck by another vehicle, and the other collapsed and died from internal injuries caused in the accident. Police say that a third person died of a heart attack.