A man in his 20s from the Fitchburg area went to a State Police barracks this morning and said he had personal information about yesterday's hit-and-run of a state trooper.
The man has not been charged, but is being questioned, police said.
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State Police Colonel Marian McGovern would not say whether the man was the driver of the black sedan that hit and seriously injured Trooper Joseph Drane as he worked a detail in a South Boston tunnel. However she did say he implicated himself.
Troopers were also looking for the drivers of two other cars that were cut off by the suspected hit-and-run car.
It was not clear if the man who went to the barracks was a passenger in the car or how exactly he is related to the incident.
McGovern said police are still looking for the vehicle in the Boston and Fitchburg areas.