The trooper was pulled over on the shoulder, conducting an investigation of an earlier traffic incident about 2:15 a.m. just east of Cumberland Avenue, when a Jeep hit his squad car, according to ISP.
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The trooper and driver of the Jeep were taken to local hospitals with non-life threatening injuries.
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The Cumberland ramp was closed to traffic as police investigate, as of about 3:30 a.m.
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Illinois State Police did not immediately provide any additional information on possible charges in the incident.