The Vatican has issued new instructions to speed up the handling of the "most urgent" cases of sex abuse by priests, after a series of abuse scandals.

The rules contain "more rapid procedures", it said.

Priests who sexually abuse a mentally ill adult will now be treated in the same way as those who abuse minors.

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The rules also extend the time in which the Church can take action against anyone who abused a minor from 10 to 20 years after a victim's 18th birthday.

The new 20-year limit will continue to be extended on a case-by-case basis, the Vatican said.

Existing Vatican guidance to bishops that they should report sexual abusers to civil authorities remain in effect.

Vatican spokesman Federico Lombardi said the rules were part of Church law and thus "exclusively concern the Church", while compliance with civil law was dealt with in guidelines published in April.

The Church's internal justice system for dealing with abuse allegations has come under attack because of claims by victims that their accusations were long ignored.

Analysis
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David Willey

BBC Vatican correspondent

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What is new is the classification of any attempt to ordain women as priests as "an extremely serious crime against Church law".

The Pope has decided to crack down on the small groups of Catholic women in various countries who have been pressing for their right to be ordained to the priesthood.

The Catholic Church teaches that as Jesus Christ chose only men as his apostles, women cannot legally become priests. However, the Anglican Church and many reformed churches now regularly ordain women as priests and even bishops.
The new norms also formally rule that child pornography is a crime against Church law.

Reacting to the news, the US-based Survivors Network for those Abused by Priests (SNAP) said the new guidelines were "like attacking at an elephant with a pea-shooter when the elephant is almost out of range".

"Even if these new guidelines are obeyed, their impact on the ongoing crisis is likely to be insignificant," it said.

The new Vatican document also listed the attempted ordination of a woman as a "grave crime" to be handled by the Vatican's Congregation for the Doctrine of the Faith, just as sex abuse is.

Monsignor Charles Scicluna, the Vatican's sex crimes prosecutor, said that including the two issues in the same document was not equating them, but was done to codify the most serious canonical crimes which the Roman Catholic Church handles.

"They are grave, but on different levels," he told the Associated Press at a briefing on Thursday.