The Met Police is also looking for the boys’ father Imran Safi, who is accused of abducting them in south London on August 20.
The boys – Bilal, Mohammed Ebrar and Mohammed Yaseen Safi – were said to have been taken by their father after he allegedly threatened a foster carer.
Today, as part of the nationwide investigation, a 17-year-old was arrested at a home in Connaught Road in Knowle West, Bristol.
He was arrested on suspicion of being involved in the abduction of the Safi brothers.
He is the 14th person to be arrested in connection with the case.
Detective Superintendent Neil Cochlin of the Metropolitan Police has now appealed for people in the Bristol area to report any sightings of the boys, or their father.
He said: “Since the brothers were taken by their father, Imran, we have made a significant number of arrests that started in the Croydon area and then took us to Ilford, east London.
“Following these leads we have now arrested a man in Bristol today.
“I now call on the communities in Bristol to report any possible sightings of the boys or Imran and to call police if they think they have any information that can assist in this investigation.”
Since detectives appealed for information of the whereabouts of the Safi brothers and their dad, 48 calls have been made to police and via Crimestoppers.
Anyone who believes they have seen Imran Safi and his children since Thursday, 20 August is urged to contact police immediately through the investigation control room on 07942599374 – this number is operational 24 hours a day seven days a week.
Alternatively, to stay completely anonymous, contact the charity Crimestoppers on freephone 0800 555 111 or fill in their simple and secure anonymous online form.
Sign up to our daily newsletter using the box at the top of this article, read all about what’s involved here, or click here to see all of our newsletters
Any member of the public who may see Imran Safi should avoid approaching him but call police immediately on 999.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .