A Buffalo man has been charged with aggravated driving while intoxicated and accused of having a blood-alcohol content of 0.24 percent, three times the legal limit, after being stopped for driving at night with no lights, state police reported Tuesday.

Troopers working with the Operation Impact initiative in Buffalo on Sunday and Monday nights stopped the vehicle driven by Rum Thar, 36, on West Ferry Street. He was charged with DWI before the blood-alcohol reading led to the more serious charge of aggravated DWI, according to police reports.

State police arrested six people in four different vehicles as part of Operation Impact on the two nights.