SAN JUAN, Puerto Rico -- Gunmen opened fire at a birthday party in northern Puerto Rico and killed three people including a 4-year-old boy, police said Tuesday.
The shooting injured two other children, ages 9 and 10, in the attack Monday night at a public housing complex in the U.S. territory's coastal town of Cataño, police said in a statement.
Police said two men were killed at the party and that the 4-year-old boy died at a hospital on Tuesday.
Officials said the boy was not related to the men, adding that they believe the shooting was tied to drug trafficking.
No one has been arrested.
