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WYOMISSING, Pa. (CBS) — A chain-reaction crash in Berks County during a snow squall left behind mangled cars and trucks Wednesday. Visibility at the time was near zero. Police say approximately 27 vehicles were involved in the crash, including two tractor trailers.

In total, 24 people were injured, according to Wyomissing police. Two people were transported to Reading Hospital in critical condition.

Fifteen victims were evaluated at the scene by emergency medical services. Nine of those people were transported to Reading Hospital.

Eight other involved in the wreck were transported to the Township of Spring Fire Department for reunification with families and further interviews.

Dozens of vehicles were involved in the massive pile-up on Route 222 near the Route 422 Business Exit in Wyomissing around 2 p.m.

Police say several people were trapped inside their vehicles, while others skidded off the road into a ravine.

A snow squall caused “dangerous, life-threatening travel conditions,” at the time of the crash, police say. Drivers battled whiteout conditions with visibility near zero on the snow-covered road.

An investigation into the accident is ongoing. Any witnesses are asked to contact Wyomissing Police at 610-375-6102.