After a week of deliberations, the jury in the trial of John A. “Junior” Gotti indicated yesterday that it was deadlocked on a racketeering charge against the son of the late mob boss.

Jurors, at the urging of the judge, were to resume deliberating on today in federal court in Manhattan. In a note to U.S. District Judge Shira Scheindlin, the jury asked what it should do if it were deadlocked over the question of Gotti’s so-called withdrawal defense.

Gotti, 41, claims he quit the Gambino organized crime family before July 22, 1999, meaning the five-year statute of limitations would have expired on racketeering charges. The judge read the jurors a charge encouraging them to keep deliberating until they reached a unanimous verdict. They worked for about another two hours before quitting for the day.

Prosecutors allege Gotti ordered his Gambino crew to give radio personality Curtis Sliwa a severe beating in retaliation for Mr. Sliwa’s on-air rants against Gotti’s father, John Gotti. A masked hit man shot Mr. Sliwa, a WABC radio host and the outspoken founder of the Guardian Angels crimefighting group, during a struggle in a taxi. Mr. Sliwa survived, and he testified last month against Gotti, as did admitted mobsters who pleaded guilty and became government cooperators.

Gotti faces a sentence of up to 30 years in prison if convicted on multiple racketeering charges. His father was sentenced to life in prison in 1992 and died there 10 years later.