On Thursday, British authorities announced charging 17-year-old teen with murder.
The boy was charged with stabbing three girls, and wounding other 5 girls and 2 adults in a dance school.
The Merseyside Police force said the teenager faces three counts of murder and 10 of attempted murder over people injured in the attack.
He is set for a court appearance in Liverpool later Thursday.
On Tuesday, British authorities announced that the death toll of Southport knife attack jumped to 3 after the death of a nine-year-old girl.
The authorities added that there are still 5 children, and two adults in a critical condition in the hospital.
On Monday, two children were killed and nine more were injured, including 6 in critical condition, in a stabbing attack in Southport, in Merseyside, north of Liverpool, England.
The knife attack took place during a dance event. Police arrested a-17-year-old boy in connection with the attack.
Authorities highlighted that two adults were also critically wounded in the incident as they tried to defend the children.
The children were participating in a dancing event at a dance school when the attacker walked with a knife and "started to attack inside the children," Chief Constable Serena Kennedy of Merseyside Police told reporters.
Kennedy added: "We believe that the adults who were injured were bravely trying to protect the children who were being attacked."
She described: "As a mum and a nana, I can’t begin to imagine the pain and suffering that the families of the victims are going through at this moment and time and I wish to send my heartfelt condolences to them."
Moreover, police described: “Enquiries are ongoing to establish the motive for this tragic incident."
In the same context, officials say the attack is not being treated as terror-related and no one else is believed to be connected to the incident.
Patients were rushed to Alder Hey Children’s Hospital, Aintree University Hospital and Southport and Formby hospital.
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