On July 14, 1983, a Cumberland County jury found Timothy Rowe guilty of Hindering Apprehension or Prosecution (Class B), 17-A M.R.S.A. § 753(1)(C) & (2) (1983), for his participation in the destruction of evidence relating to a murder committed in Windham.1 The defendant appeals the *780judgment entered on the jury’s verdict claiming that he was twice put in jeopardy for the same offense in violation of his constitutional rights. Me. Const, art. I, § 8. We agree and vacate the conviction.
By indictment dated January 13, 1983, the defendant was charged with the murder of Michael Moore and with hindering the apprehension or prosecution of another. His brother, Harold, was charged with murder in the same indictment. During the investigation of the murder, both Timothy and Harold gave statements to the police regarding Moore’s death. Timothy’s statement contains several admissions by Harold that he intentionally killed Moore.2 Harold’s statement recites admissions by Harold that he planned to kill Moore, had communicated this fact to Timothy and asked to use his gun, and in fact Moore had been shot with a gun allegedly supplied by Timothy, but his statement also relates facts indicating that the killing was accidental.3
The State chose to try Timothy and his brother jointly. On the third day of trial, after ten prosecution witnesses had testified, the State’s attorney sought a ruling from the presiding justice as to the admissibility against Harold of a redacted version of the statement Timothy gave to the police. By making such a request, the State implicitly acknowledged that it anticipated a problem under Bruton v. United States, 391 U.S. 123, 88 S.Ct. 1620, 20 L.Ed.2d 476 (1968), in gaining admission of Timothy’s statement.4 Timothy’s counsel objected to the use of the redacted version and insisted that if the court permitted the State to use the statement in the joint prosecution, it be required to introduce the entire statement since the portion excised from the redacted version tended to show that Harold, not Timothy, committed the murder. The court advised counsel that Bruton prohibited the admission in evidence of Timothy’s complete statement.
Outside the presence of the jury, the justice heard argument by the State that the admission of Timothy’s redacted statement would not violate Bruton because it “interlocked” with the statement Harold gave to the police.5 The justice expressed doubt that the statements were sufficiently interlocking to permit Timothy’s redacted statement to be admitted under the State’s theory, but did not formally rule on the issue until he heard Detective Johnson testify as to the substance *781of the statement Harold gave to him.6 After Johnson testified, the State advised the court that it would offer the testimony of Detective Herring regarding the content of Timothy’s redacted statement. The justice acknowledged that the statements of Harold and Timothy had “interlocking features” but concluded that Timothy’s statement could not be admitted in the joint prosecution even in its redacted form because it still tended to establish a critical element of the State’s ease, viz., Harold’s intent to kill Moore.7
Without consulting either defense counsel or the prosecutor, the justice ordered the cases severed. Apparently out of concern for potential double jeopardy issues, the prosecutor immediately inquired whether defense counsel had moved for severance. In effect, the prosecutor asked whether counsel consented to the order. Counsel for both Harold and Timothy made it clear that they were not requesting severance and the justice explained to the prosecutor that he understood that defense counsel maintained that the joint trial should go forward as long as the statements of Harold and Timothy were excluded in their entirety. Counsel for neither defendant, however, objected to the order.
A discussion ensued in chambers regarding which defendant would be severed from the proceedings. The State asked to complete the trial of Harold because, according to the prosecutor, “the evidence indicates ... that Harold Rowe committed the murder.” The State expressed concern about the possibility of securing» a conviction of Timothy, whom the prosecutor viewed as the “less culpable person,” and Harold’s being acquitted in a subsequent proceeding. The justice granted the State’s request to proceed with the trial of Harold.
In July 1983, after Timothy’s counsel unsuccessfully argued that any further prosecution would violate his client’s right to be free from double jeopardy, Timothy was retried on the same indictment. He was acquitted of murder but convicted of hindering apprehension or prosecution.
Following the primacy approach approved in State v. Cadman, 476 A.2d 1148 (Me.1984), we test the defendant’s challenge by the Maine Constitution and we conclude that his trial after severance violated his right of not twice being put in “jeopardy of life or limb” guaranteed by article I, section 8.
It is a fundamental principle of criminal law that in a criminal prosecution tried to a jury, jeopardy attaches as soon as the jury is impaneled and sworn. State v. Linscott, 416 A.2d 255, 258 (Me.1980); State v. Slorah, 118 Me. 203, 208, 106 A. 768, 770 (1919). In jury disagreement cases, once jeopardy attaches, a defendant will not lose his opportunity to obtain a favorable verdict from a particular jury and will not be required to stand trial a second time unless he consents to a mistrial, State v. Fredette, 462 A.2d 17, 20 (Me.1983); State v. Small, 381 A.2d 1130, 1132 n. 3 (Me.1978); Clukey v. State, 160 Me. 198, 200, 202 A.2d 6, 8 (1964), or unless under all the circumstances, the mistrial was mandated by manifest necessity. Henderson v. Wright, 533 F.Supp. 1373, 1375-76 (D.Me.1982); State v. McConvey, 459 A.2d 562, 565-66 (Me.1983); State v. Henderson, 435 A.2d 1106, 1107 (Me.1981); see Arizona v. Washington, 434 U.S. 497, 98 S.Ct. 824, 54 L.Ed.2d 717 (1978). We view the severance order in the instant case as the functional equivalent of a declaration of a mistrial as to Timothy. Accordingly, because jeopardy attached to Timothy at the time the jury was impaneled and sworn at the joint trial with Harold on April 11, 1983, the defendant’s retrial violated his right to be free from double jeop*782ardy unless severance were mandated by manifest necessity.8
The double jeopardy provision of the Maine Constitution protects both the valued right of the accused to have his trial completed by a particular tribunal once jeopardy attaches as well as the public’s interest in just judgments. State v. Pierce, 459 A.2d 148, 151 (Me.1983). When the circumstances of a particular case warrant judicial recognition that the interests of the public take precedence over the interests of the defendant, manifest necessity is present and retrial is constitutionally permissible. Because of the importance of a defendant’s right to be free from double jeopardy, the State must shoulder the heavy burden of justifying a mistrial as manifestly necessary. Linscott, 416 A.2d at 259. Appellate decisions supply no mechanical formula to be applied by the trial court in determining whether a particular case presents facts that would justify a mistrial and permit a subsequent prosecution.9 Illinois v. Somerville, 410 U.S. 458, 462, 93 S.Ct. 1066, 1069, 35 L.Ed.2d 425 (1973). There is no question, however, that a “high degree” of necessity is required before a trial court properly can conclude that termination of the proceedings is appropriate. Washington, 434 U.S. at 506, 98 S.Ct. at 831; Henderson v. Wright, 533 F.Supp. at 1376. A trial justice enjoys broad discretion in making this determination, Washington, 434 U.S. at 510, 98 S.Ct. at 832; McConvey, 459 A.2d at 566; State v. Henderson, 435 A.2d at 1108, and his decision is entitled to great deference on appeal except where the record reveals a failure to exercise sound judicial discretion. Linscott, 416 A.2d at 260, quoting Washington, 434 U.S. at 510 n. 28, 98 S.Ct. at 832 n. 28.
In the instant case, the trial justice ordered severance after he concluded that Timothy’s redacted statement, if admitted, would violate Harold’s rights under Bru-ton. Although the justice’s ruling was correct on the Bruton issue, the decision to sever Timothy’s case was not a sound exercise of judicial discretion because the State failed to demonstrate at trial any necessity for the severance. Manifest necessity simply cannot exist where, as here, the trial justice had a clear alternative — sustaining *783Timothy’s objection to the admission of the redacted statement — that would have both protected Harold’s Bruton rights and preserved intact the joint prosecution format selected by the State.10 See Bretz v. Crist, 546 F.2d 1336, 1347-50 (9th Cir.1976), aff'd, 437 U.S. 28, 98 S.Ct. 2156, 57 L.Ed.2d 24 (1978). Moreover, there is no indication that the ends of public justice could not have been served had the State been required to continue with the prosecution without the admission into evidence of Timothy’s redacted statement.
The State had in its possession the statements of Timothy and Harold for four months prior to the start of the joint trial and, as we have previously noted, should reasonably have foreseen a Bruton problem if it intended to offer some version of Timothy’s statement at trial. In fact, the State acknowledges in its brief to this court that it created the Bruton problem by neglecting to obtain a pretrial ruling in conformance with the American Bar Association standard we approved in State v. Wing, 294 A.2d 418, 422-23 (Me.1972). See note 10 supra. The State cannot rely on a problem created by its own neglect to establish the existence of manifest necessity. By requiring Timothy again to stand trial for the offenses charged in the January 13, 1983 indictment, the State denied him the right guaranteed by article I, section 8, of the Maine Constitution: “No person, for the same offense, shall be twice put in jeopardy of life or limb.”
The entry is:
Judgment of conviction vacated.
Remanded to the Superior Court with directions to dismiss the indictment.
All concurring.