A teen girl who urged her boyfriend to commit a horrific knife attack on his ex in a sinister murder plot has been jailed.

Sarah Mohamed encouraged Rhett Carty-Shaw, 17, to kill his former partner in May.

This came after she grew “incensed” and “humiliated” when she discovered he had secretly continued to see her, Greater Manchester Police (GMP) said.

She dumped him and then persuaded him to carry out the attack, before he visited the victim's home to do so.

Following constant pressure from Mohamed, also aged 17, Carty-Shaw used a large kitchen knife to repeatedly stab his victim, named in media reports as Imam Nasir, at her home.

He told the victim that he was being pressured to kill her and said if he did not then people would harm his family.

In the exchange before the attack he asked if she would kill herself for him and how he should kill her. She even put on make up to fake being dead to send faux evidence that he had gone through with the murder.

Ms Nasir recovered from her serious injuries in hospital following the incident in Openshaw, Manchester, the force said.

He inflicted wounds to her neck, head and back.

GMP said Mohamed, 17, loitered close to the victim’s address during the incident.

She was “constantly pressuring” Carty-Shaw with text messages instructing him to video the act, police said.

They were each jailed for 16 years at Manchester Crown Court on Friday, GMP said.

Mohamed was sentenced for intentionally encouraging someone to commit murder, while Carty-Shaw was sentenced for attempted murder and possessing an offensive weapon, according to the force.

Detective Inspector Jennifer Tattersall said: “The defendants devised a devious plan to murder the victim, with the boy seeing fit to arm himself with a knife and inflict life-threatening wounds to the victim.

“Thankfully, the wounds sustained in this brutal attack weren’t fatal.​"