LITTLETON, MASS. (WHDH) - Police are investigating after a drunk driver allegedly lost control of his vehicle, causing it to flip onto its roof in Littleton early Saturday morning, police say.

Emergency crews responding to the area of 650 Great Road found 25-year-old Ian Kilpatrick, of North Reading, sitting near his overturned Honda Civic, according to Littleton police.

Kilpatrick was transported to a local hospital with non-life-threatening injuries, where police say officers determined he had been operating under the influence of alcohol.

Bystanders who witnessed the accident say they saw a male passenger flee the scene into a nearby wooded area.

The man was later identified by Groton police and taken to the hospital for evaluation.

The passenger has not been charged or cited as a result of the crash, police say.

Kilpatrick is facing charges of driving under the influence, negligent operation of a motor vehicle, and committing a marked lanes violation.

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