Teenager charged after boy, 11, shot in face and neck

A teenager has been charged after an 11-year-old boy was left critically injured from being shot in the face and neck.

Emergency services discovered the boy suffering a gunshot wound at a unit in Norwest, in Sydney's Hills District, about 5pm on Monday.

The boy was shot from inside the home and was rushed to hospital in a critical condition, where he remains.

Four 18-year-old men and a 44-year-old woman were also present at the luxury apartment complex when authorities arrived.

Three of the men were arrested, but two were released pending further investigation.

On Tuesday morning, police said one of the 18-year-olds had been charged with concealing a serious indictable offence.

Superintendent Naomi Moore on Monday said the group had been allowed access to the home.

The boy's mother was distressed by the incident and was by her son's bedside in hospital, she said.

"She is as distressed, as any parent would be, about what she is dealing with at the moment," she told reporters.

"It is an (absolutely) tragic situation and as we've seen some tragedy across Sydney in the last couple of days, this is not far from the worst that I have seen."

Detectives had no reason to suspect the shooting related to organised crime, she said, but would not speculate what occurred in the house.

Police established a crime scene at the address and an investigation is continuing.