Officers are searching for a man sought in connection with a jewellers in Nottinghamshire.
Matthew Porter, 35, of St Nicholas Road, Boston, was arrested on suspicion of conspiracy to commit robbery at Andrew Michaels Jewellers in Newark on January 6.
He was arrested on January 11and released on bail - but has failed to answer to his bail and is now wanted.
Detective Inspector Jamie Hill said: “Porter is wanted in connection for a serious offence and it is extremely important we track him down.
“He has strong connections to the Boston area and we believe there will be someone in the town who knows of his whereabouts.
“If Matthew is reading this, we would strongly urge him to hand himself in as soon as possible as he is only succeeding in making matters more difficult for himself in the long run.”
Anyone with information on Porter’s whereabouts is urged to call Nottinghamshire Police on 999 or Crimestoppers anonymously on 0800 555 111.