The girls, ages 13 and 15, were accompanied by their parents when they surrendered to authorities on Monday.
Three other teenage girls were charged in the incident last week.
The attacks took place on Oct. 11. A man was sprayed with a chemical on his arm. Five minutes later, youths sprayed a woman in the face and began to hit her about the head and shoulders. Some passers-by went to her aid. She was taken to Wilmington Hospital.
Information from: The News Journal of Wilmington, Del