The cold-blooded killer of a teenager was today warned that 'the net was closing in'.

Detectives investigating the shooting of 16-year-old Yasser Hussain Nazir, said they were moving ever closer to his murderer and that it was only a matter of time before they caught up with him.

And officers revealed Yasser's killing was probably the final bloody instalment of a gang feud which had already seen numerous violent confrontations.

Yasser was blasted in the head with a shotgun from close range as he sat in his car at a petrol station in Haworth Road, Bradford, on September 5.

A green Honda Accord pulled up alongside his white Vauxhall Astra before two shots were fired from the passenger window. Yasser, of Chatsworth Street, Keighley, died at the wheel.

It has since been revealed that he may have been caught up in a violent gang feud, likely to have involved drugs, between two groups of men.

Violence first erupted at the Keighley mela where Yasser was arrested as a suspect.

The same gangs are thought to have clashed in the Lawkholme area of Keighley in late August. There, eyewitnesses reported gunshots being fired and men attacking a car with wooden clubs. One was thought to have been hit by a speeding vehicle. There are thought to have been up to a dozen more small-scale battles between them before the shooting.

Detective Superintendent Phil Sedgwick, who is leading the murder hunt, said: "It appears that there had been bad blood and ill feeling between two groups of young men."

Detectives are building an increasingly clearer picture of the members of the groups who come from both Keighley and Bradford. Officers have arrested eight men in connection with the murder and released them on bail while their inquiries continue.

The latest arrest, a 40-year-old man from Keighley, was questioned by detectives and released yesterday.

Anyone with information on the shooting should call the incident room on (01274) 376225.