Terrifying moment a woman attacked a 15-year-old boy with an 8in kitchen knife

CCTV shows the moment a woman wearing a kangaroo headscarf attempted to stab a 15-year-old
CCTV footage captures the moment a woman tried to stab a 15-year-old boy with a kitchen knife as he boarded a bus on Brixton Road, in London with his grandmother. 
The suspect, who was already on the bus, attacked the boy before his grandmother intervened. The grandmother managed to disarm the suspect, who then got off the bus and fled towards Oval. The boy suffered a minor cut to the stomach, the Metropolitan Police said.

CCTV footage released by Scotland Yard captures the moment the woman and 15-year-old were on the bus on Brixton Road, in London

The teenager suffered a cut to his stomach during the attack at around 12.30 Boxing Day last year 

The victim's grandmother managed to disarm the woman who then left the bus. The eight inch kitchen knife (pictured) was later recovered by police