Darien police officer sustained minor injuries in a head-on collision with a suspected drunken driver Sunday morning, according to police.

The officer, Sgt. Jeremiah Johnson, was driving west on Old Kings Highway South when the accident occurred shortly before 4 a.m., Darien Police Sgt. Jeremiah Marron said. He was treated and released from Stamford Hospital early Sunday morning for minor injuries to his ankle and lower back, Marron said.

The driver, Cesar Lorenzo, 33, of 36 Martin Luther King Drive, Norwalk, was charged with driving under the influence, and cited for failure to maintain the correct lane and operating without a valid license, according to Marron.

Johnson reported at 3:53 a.m. that his marked shift supervisor vehicle, a Ford Explorer, had been struck head-on by a car heading eastbound on Old Kings Highway South, Marron said.

Police arriving on the scene found Lorenzo’s 1999 Saturn facing east in the westbound lane where it was facing the damaged police vehicle, Marron said.

Lorenzo told police he had between five and seven beers Saturday night into Sunday morning, Marron said. During processing at police headquarters, officers administered two Breathalyzer tests which recorded blood alcohol levels of .15 and .14, Marron said.

Lorenzo was released on $2,500 bond, and is to appear in state Superior Court in Stamford on Oct. 2.