RONKONKOMA, N.Y. (CBSNewYork) — A Long Island woman is accused of leaving the scene of a crash that seriously injured two boys on bicycles.

It happened shortly after 7 p.m. Monday on Express Drive North in Ronkonkoma.

READ MORE: Gov. Cuomo Says He Will Not Resign Amid Sexual Harassment Allegations: 'I Never Touched Anyone Inappropriately'

Police said three boys were riding in the shoulder when two of them were hit.

READ MORE: New Jersey State Health Department Investigating Legionnaires' Disease Cluster In Union County

A 9-year-old victim was airlifted to Stony Brook University Hospital with serious injuries. A 12-year-old was also treated for serious injuries.

A third boy, only 6 years old, was not hurt.

MORE NEWS: PSEG Long Island Updates Osprey Cams, Cleans Debris From Nests

Early Tuesday morning, police arrested 31-year-old Shannon Palmer outside her Hauppauge home. She was charged with two counts of leaving the scene of an accident with serious physical injuries.