TWO teenagers have been arrested on suspicion of murdering 15-year-old Negus McClean in Edmonton.

The boys, aged 14 and 16, were taken in for questioning by police today, five days after the Edmonton County pupil was stabbed to death.

He was found in a pool of blood in Westminster Road on Sunday night, after eyewitnesses saw a gang of up to 13 teenagers on mountain bikes chasing Negus.

A post mortem on Tuesday found he had been stabbed through the heart during the attack.

Three teenagers, aged 18, 16, and 14, and a 20-year-old man were arrested shortly after the murder, and are on police bail as the investigation continues.