The public prosecutor shall without delay inform the competent authorities of the executing State, by any means which leaves a written record, of any circumstances or findings brought to his attention which appear to him to be such as to give rise to a modification of the probation measure or alternative sanction, the revocation of the suspension of enforcement of the sentence or of the decision on conditional release, or the imposition of a custodial sentence or measure involving deprivation of liberty on account of non-compliance with an alternative sanction or probation measure.