"That's a good question, " Assistant District Attorney John O'Mara, who heads the district attorney's Conviction Integrity Unit, said after a judge released Ranta.

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The Brooklyn District Attorney's Office said that the Conviction Integrity Unit would review the case.

WSJ: Accused Killer Leaves Prison After 23Years

Prosecutors have determined the evidence underpinning Ranta's conviction "has been degraded to such an extent" that it would no longer support the verdict, said John O'Mara, the deputy district attorney in charge of Brooklyn's conviction integrity unit.

CNN: Freed NY convict's first goal: 'Get the hell out of here'

Judge Asril Marwan told the Banda Aceh district court that Ms McCulloch's actions "could have threatened national security and the territorial integrity of the Republic of Indonesia".

BBC: Foreign women jailed in Aceh