JOHNSTON COUNTY, N.C. — Four people, including a mother-to-be, were injured early Saturday morning after a hit-and-run accident, Johnston County authorities said.

The pregnant woman, Maria Hernandez, underwent an emergency Caesarian section at WakeMed. She and her baby were listed in critical condition Saturday evening.

The head-on collision happened at about 12:45 a.m. Saturday in Johnston County on Fire Department Road, which is about two miles north of Wilson Mills. State Highway Patrol troopers said Cayetano Frias Flores II slammed into an oncoming vehicle, and then fled the scene on foot.

Two other passengers in the vehicle were also listed in critical condition Saturday: Miguel Rafael, 30, of Slema, who is at UNC Hospitals; and a 2-year-old child, who was airlifted to Pitt Memorial Hospital.

The driver, 16-year-old Euli Merceya Ayala, of Selma, was treated for minor injuries and later released from Johnston Memorial Hospital.

Authorities arrested Flores, 20, later Saturday morning and charged him with driving while impaired, reckless driving, felony hit-and run, driving with a revoked license, and four counts of felony assault with a deadly weapon inflicting serious injury.

Flores was in the Johnston County Jail Saturday night on a $353,000 bond.