Two young siblings were killed and two other members of the same family injured Wednesday night during an attack at a home in the northern suburbs of Atlanta, authorities said.
Authorities were trying to determine late Wednesday the cause of the violence in Lawrenceville, a Gwinnett County Sheriff's Department spokesman said.
Two brothers, ages 1 and 4, were killed, CNN affiliate WGCL reported. A 4-year-old and an adult identified as the father were also injured, the affiliate said.
The adult escaped the attack and fled to a neighbor's house, the affiliate reported.
Two families lived in the home where the attack occurred, and the family that was attacked lived in the basement, police told the affiliate.
No suspects have been identified, the spokesman said.