A federal judge in Worcester declared a mistrial Monday in the case of a suspended state probation official who is charged with intimidating a witness during the FBI investigation of allegedly corrupt hiring practices at the troubled state agency. The mistrial in the case against Christopher Hoffman, 40, of Hatfield was declared when jurors failed to reach a verdict after two days of deliberations, records show. The court clerk was scheduled to set a status conference on Monday to determine if the case will be retried. Hoffman ran the probation office in Hampshire Superior Court in Northampton until he was suspended in October 2011.Travis Andersen can be reached at email@example.com. Follow him on Twitter @TAGlobe.