Moment Brazilian boy, 16, disarms and shoots bank's security guard, 47, in the neck before hiding behind his mother

This is the terrifying moment a teenager disarmed a security guard and shot him at a bank in Brazil on Thursday. 

Surveillance camera footage showed the 16-year-old boy walking with his mother when he suddenly pulled Samuel da Silva's weapon out of his holster Banco do Brasil in Bauru, São Paulo. 

The teen, whose name is being withheld because he is a minor, aimed the gun at the 47-year-old Banco do Brasil guard and shot him in the neck. 

Da Silva could be seen collapsing to the ground while the mother confronts the teenager, who places the gun on the floor. 

A 16-year-old boy (left) disarmed security guard Samuel da Silva at Banco do Brasil in São Paulo, Brazil on Thursday and shot him in the neck. Da Silva is recovering at an area hospital

Samuel da Silva has a bulley lodged in his neck and remains hospitalized 

The boy then hid behind his mother as two guards aimed their guns at him. 

One of the guards fired a shot but missed striking the teen. 

The boy was arrested on the scene and taken to the local Bauru Civil Police station, where he was questioned and was unable to explain why he attacked the guard.

São Paulo Military Police first lieutenant Luiz de Souza said that investigators continue to look into what would have motivated the teen and revealed that the boy reportedly suffers from a mental illness. 

The 16-year-old boy, whose name has not been released, was seen on camera hiding behind his mother moments after he disarmed a security guard at a bank in Bauru, a city in the southern Brazilian state of São Paulo

After shooting the security guard at Banco do Brasil in São Paulo on Thursday, the teenager placed the gun on the floor near the injured victim's body and was confronted by his mother 

'The mother said she believed he had a psychiatric problem, without diagnosis or specialized monitoring, and had an episode. But that is still not clear,' de Souza said, according to Brazilian outlets.

Da Silva had a bullet lodged in his neck and was rushed to an area hospital. 

The Bauru Health Department said in a statement that da Silva was going to undergo a CT scan and that he was in stable condition.

Banco do Brasil also said in a statement it is providing support and medical care to da Silva, who was hired through a security company.