A New York jury which has been considering racketeering charges against John "Junior" Gotti for more than a week has told a judge it's unable to agree on a verdict.

The judge presiding over the trial in Manhattan federal court told jurors to keep deliberating until it reaches a unanimous verdict.

The trial is the fourth time prosecutors have sought a conviction against Gotti. Three previous trials ended in hung juries.

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In the latest case, the government linked Gotti to a string of murders in the 1980s and 1990s and to drug trafficking. He denied the charges, claiming he quit the mob more than a decade ago.

His father died in prison while serving a life term for his 1992 murder and racketeering conviction.