VIENNA — Authorities have issued a European arrest warrant for Austria's purported oldest murderess, who was released early on grounds of ill health, then traveled to the Vatican and apparently never returned.

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Bronislawa Jarosz, 83, a Polish citizen, was convicted of killing her neighbor in the town of Korneuburg in 2007 and sentenced to 18 years. She was freed early because she was deemed too sick to stay. But a more recent exam found her fit enough to be in prison.

Police can't arrest her, though, because she apparently never returned from a trip to see the Pope, says Wiener Neustadt Court spokesman Hans Barwitzius.

He said Friday a European arrest warrant has been issued to ensure Jarosz serves the remaining "16 years, three days and eight hours" of her sentence.