The 16-year-old who allegedly attacked and injured a baby Wednesday is facing charges including uttering death threats and assault with a weapon in connection with the incident.

Police were called to a home on Rymal Road East around 3:30 a.m. after reports of an injured child who was under the age of two.

They found a female teen, and two children, including a baby that had been injured.

Investigators say the girl was about 22 months old. She suffered serious injuries but is expected to survive.

The male teen, meanwhile, had barricaded himself in the house. A nearly eight-hour standoff followed, as officers negotiated with him before forcing their way into the house and taking him into custody just before 11:30 a.m.

A search of the home revealed the family's dog was dead. Police have charged the teen with killing or injuring an animal.

The 16-year-old was not seriously injured when he was taken into custody, but was transported to hospital for examination because he had been in the home for so long and his "behaviour has been characterized as unusual," said Const. Jerome Stewart.

On Thursday police said the 16-year-old also faces the following charges:

Assault.

Assault with a weapon.

Aggravated assault.

Uttering threats to cause death.

Failure to comply with an undertaking.

Police would not say whether all of the charges above were connected to the baby, or if any of them related to other possible victims.

Because of the teen's age, investigators have not released his identity or provided any details about how he knew the people living in the home where the attack happened.

Stewart would only say he is "known to the family."

Neighbours tried to help bleeding baby

Tara Young and her daughter Kyra Payne live just two doors down from where the attack happened.

They said they were woken up by the sound of someone pounding on the door and screaming for help.

Kyra said when she opened the door she found one of her neighbours holding a baby that was covered in blood and wearing only a diaper.

"She said 'My boyfriend went crazy and he's trying to kill us," the 12-year-old remembered.

The wounds on the baby appeared to be caused by a knife, her mother added.

"I come down and in my living room standing there is a female with a blood-covered baby, covered in cuts and another child and she's screaming for me to call 911," said Young.

Kyra Payne, 12, and her mom Tara Young say they opened their door around 3 a.m. to find a neighbour holding a baby covered in blood. 0:22

The house where the attack allegedly happened was home to a woman, who is the mother of the baby, the little girl who was injured, a child about three years old and the woman's 15-year-old sister, according to their neighbour.

It was the female teen who was yelling for help and brought the baby and other young child over to Young's house, she said.

It's not clear where the baby's mother was during the attack or the standoff that followed.

"I just did what I had to do, tried to stop the bleeding on the baby," said Young, adding the baby "wasn't crying or anything, she was just wanting comfort."