At least two attackers opened fire inside a 7-Eleven shop in Capitol Heights, Maryland, on Saturday, killing a 15-year-old child and wounding three others.
Police identified the youngster as De'Andre Johnson of Washington, D.C.
Police offer $25,000 for information leading to the murderers' capture.
Saturday night's shooting happened at a Capitol Heights 7-Eleven on Ritchie Road, police said.
Two suspects entered the business and fired fire before escaping, authorities said Sunday. "This does not seem to be a robbery or random incidence at this juncture in the inquiry.
Investigators are looking at whether any customers were targeted."
Police offer a $25,000 prize for information leading to the murderers' capture and indictment.
Police said another 15-year-old was shot. Officials claimed the boy's condition was serious.