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The hunt to find Colchester killer James Fairweather was "one of the biggest investigations" carried out by Essex Police, according to Assistant Chief Constable Steve Worron.
17-year-old Fairweather from Greenstead - who was 15 when he killed his victims - has been convicted of murdering two strangers in frenzied attacks in Colchester.
He was hunting for his third victim when he was caught by police.
The hunt to find the murderer was "one of the biggest investigations" carried out by Essex Police, according to Assistant Chief Constable Steve Worron (pictured).
After the verdict, he said: "Fairweather admitted killing James and Nahid but denied their murder was calculated and pre-planned.
"He then forced their families to endure the pain and grief of a trial rather than admitting that he had murdered them.
"Today's verdict will never heal the pain of losing their loved ones in such horrific circumstances.
"Hopefully they now have some answers and can be reassured that their killer will face a long time behind bars."
Paul Scothern, of the Crown Prosecution Service, said: "This was a shocking case, particularly because of the young age of the defendant at the time and because the brutal attacks he carried out were entirely random."
Mr Scothern said Fairweather had "absolutely no reason" to attack them, adding: "Our evidence was that he was in control at the time, he knew what he was doing, he prepared for the killings by arming himself with a knife and gloves, and he took steps afterwards to conceal what he had done."