Four people have been killed and nine others injured in a shooting at Apalachee High School in the city of Winder, Georgia.

Officials have identified those who died as students Mason Schermerhorn and Christian Angulo, and teachers Christina Irimie and Richard Aspinwall.

The 14-year-old suspect, Colt Gray, was arrested and will be prosecuted as an adult.

Here is what we know so far about the attack victims.

Schermerhorn was one of two 14-year-olds killed. Friends of his mother told the New York Times that he had recently started at Apalachee.

He was described as lighthearted, and enjoyed reading, video games and visiting Walt Disney World.

Schermerhorn had an “upbeat attitude about everything”, Doug Kilburn told the newspaper.

Louis Briscoe described the moment he heard of Schermerhorn’s death from the boy’s mother, commenting: “Nobody should have to go through this type of pain.”

Lisette Angulo identified herself as the elder sister of the shooting’s other 14-year-old victim.

In a GoFundMe page aimed at raising money for the funeral, she said her brother was “a very good kid and very sweet and so caring”. She went on to say the boy was “loved by many”, describing her heartbreak at her loss.

Schoolmates remembered him as funny and with a “chill” attitude, Fox 5 Atlanta reported. One friend who said the two had been close since middle school said he was “in denial” after hearing about the deadly shooting.

Christina Irimie was one of two teachers killed in the shooting.

The 53-year-old is named on the Apalachee High School website as a maths teacher.

Students described her as patient and caring, Fox 5 Atlanta reported.

A second maths teacher, 39-year-old Richard Aspinwall, was also killed.

He was also the school’s American football defensive coordinator, US media reported. He has received tributes from his sporting peers.

Nearby Mountain View High School identified Aspinwall as its former teacher and coach, saying its “thoughts and prayers” were with his family.

Brandon Gill, the football coach of nearby Buford High School, wrote on social media that Aspinwall was a “helluva human being” who “would do anything for anyone.” He was an “amazing husband, father, teacher and coach”, he added.

As well as the four people who were killed, eight students and a teacher were wounded.

The teacher was identified by his daughter as David Phenix. He has a role in curriculum assistance, according to the school’s website.

His daughter said he underwent surgery after being shot in the hip, and that she felt “so, so lucky” he had survived.

Little has been revealed about the eight children who were injured.

Police say all those who were hurt in the attack are expected to recover.