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(CNN) - About 100 vehicles were involved in a series of wrecks on the eastbound Pennsylvania Turnpike just north of Philadelphia on Friday morning, injuring at least 30 people and causing an hours-long traffic backup for miles over parts of two counties, officials said.
Glare from the rising sun and ice - left over from a storm that dropped snow and freezing rain in the Philadelphia area - might have been factors, state police Trooper Adam Reed said.