Shocking footage shows a teen running for his life after being stabbed in the chest.

Mustafa Momand, 17, was stabbed to death in Queen’s Road, Brighton, in broad daylight.

People tried to save Mustafa but he later died at the Royal Sussex County Hospital following the attack on October 5 last year.

He was stabbed with a “force so severe” that the knife broke through his breast bone and severed one of his pulmonary arteries, Brighton Youth Court heard.

Mustafa had been walking along Queen’s Road in Brighton when the defendant, a 16-year-old from Southwick – who cannot be named for legal reasons - spotted him and stabbed him in the chest.

In CCTV footage shown to the court, Mustafa can be seen sprinting up Queen’s Road towards Brighton Station after he was stabbed.

The Argus: Mustafa Momand died after being stabbed in the chest on October 5 last yearMustafa Momand died after being stabbed in the chest on October 5 last year (Image: Family handout)

On Tuesday, the court was told Helen Shields was walking up Queen's Road with her husband Marcus. 

Mustafa Momand and the 16-year-old boy, who denies the charge of murder, ran past them. 

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A statement read out on her behalf said: “I heard people say ‘he has a blade, oh my God did you see the size of that’.

“There were big globules of blood on the floor. I opened up his shirt and saw a stab wound right in the middle of his chest. I said that we needed to compress it. 

“He was coughing up blood and there was a gurgling sound. His blood was running down the street.”

Nathan Rasiah KC, prosecuting, opened the case on Tuesday.

The trial continues.