A 15-year-old from London has been arrested in Huntingdon on suspicion of possessing Class A drugs with intent to supply.
Police said the boy, from Leytonstone, was picked up in the town during a routine patrol.
He is suspected of having crack cocaine and heroin in his possession along, with a lock knife.
A police spokesman said the boy had been released under investigation.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here