No other information about the suspect was immediately available.
According to a police report on the homicide, police found a woman and two children with gunshot wounds on Saturday afternoon in a house on Block 700 on Jessie Street, while responding to a medical emergency.
Two of the victims, a woman in her 30s and a girl in her early teens, were pronounced dead at the scene. A boy between 8 and 12 years old was rushed to the hospital, but later succumbed to his injuries, police said.
A policeman had been at the house an hour earlier to do a welfare check after a concerned relative called from Tennessee. But the woman said she was fine and refused to call the family over the police’s phone.