Two teen-aged boys were shot to death and two other teens were wounded Friday in an attack outside a Chicago high school as classes were being dismissed.

The Chicago Sun-Times reports that Nathan Billegas, 14, and Brandon Perez, 15, were killed and two other teens — a boy and a girl, both 15 — were shot outside Benito Juarez High School in the city's Pilsen neighborhood. 

Police have no one in custody in connection with the shooting. Community activists have offered $2,000 for information leading to the arrest and conviction of the gunman. 

Nathan was a student at Chicago Bulls College Prep, about 2 1/2 miles north of Juarez, and had come by the school to meet his friend Brandon, according to Nathan’s family.

The attack marks the third fatal shooting this year during dismissal outside a Chicago public high school.

In August, four teens were shot in a drive-by attack across the street from Schurz High School. This month, a 16-year-old girl was shot to death outside Michele Clark Academic Prep Magnet High School.