The boys were reported missing from their homes in Wakefield and Huddersfield, police say.
An appeal has been made to find three teenage boys who are thought to have travelled by train to London from their homes in West Yorkshire.
Jacob is described as 5ft 9ins tall, with brown hair and is potentially wearing dark-coloured cargo pants, a multi-coloured jacket, a blue beanie hat and white Nike Hi-top trainers.
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