2 in custody after 1-year-old girl shot inside South Side apartment, police source says

Two people are in custody after a 1-year-old girl was shot and critically injured inside an apartment on Chicago's South Side, a police source said. 

Chicago police were called to the 6400 block of South Mozart Avenue in the Chicago Lawn neighborhood just after midnight. 

A police source told CBS News Chicago the girl was sitting in a car seat in the living room when someone inside holding a handgun fired shots, hitting the child in the back of the head. 

Chicago police said the toddler was taken to Comer Children's Hospital in critical condition. 

The police source said the person who fired the gun was taken into custody. It's unclear who he is and whether he is related to the victim or not. It is also unclear if the shooting was on purpose or accidental.

Neighbor Jesus Salgado said he saw it all play out from his house next door.

"Police go inside the building, they put the guy in handcuffs and put him in custody," he said.

Salgado says the man arrested lived in this apartment building for about six months.

"He always say hi to me and say 'Hey, how you doing? ' and I would say hi back." 

 A gun was recovered from the apartment.   

Police said a woman was also taken into custody for attempting to conceal the weapon. Her relationship to the child is also unclear as of Saturday afternoon.

Area 1 detectives are investigating.