CHICAGO (CBS) — Four people were rushed to the hospital Monday afternoon after a Chicago Transit Authority bus crashed into a tree on North Lake Shore Drive.

The accident happened on the Drive near Wilson Avenue, the Fire Department said.

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The bus is an articulated bus that bends at the center. Tire tracks appeared to indicate that it crossed the median before hitting the tree on an off-ramp.

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Four people were hospitalized, according to the Fire Department. One was in serious-to-critical condition, the other three in fair-to-serious condition, the Fire Department said.