POPE Francis has imposed tough new laws under which Vatican officials must report any sex abuse allegations straight away.

His policy policy shift is aimed at being a model for the Catholic Church worldwide.

The mandatory reporting provision marks the first time the Vatican has put into law requirements for Catholic officials to report allegations of sex crimes to police or face fines and possible jail time.

Francis, who is head of the tiny Vatican state, also issued wider child protection guidelines.

These will apply to the Vatican City State and its youth seminary, acting after the global sex abuse scandal exploded again last year and the Associated Press reported that the headquarters of the Catholic Church had no policy to protect children from predator priests.

The law for the first time provides an explicit Vatican definition for "vulnerable people" who are entitled to the same protections as minors under church law.

The Vatican amended its canon law covering sex abuse to include "vulnerable adults" several years ago, but never defined it.

According to the new Vatican definition, a vulnerable person is anyone who is sick or suffering from a physical or psychiatric deficiency, is not able to exercise personal freedom even on occasion and has a limited capacity to understand or resist the crime.

The new law covers all personnel who live and work in the Vatican, the 110-acre city state in the centre of Rome, as well as the Holy See's vast diplomatic corps in embassies around the world.

The Vatican's ambassadors have figured in some of the most scandalous cases of abuse in recent years, with papal representatives accused of groping, distributing child pornography and sexually abusing minors in far-flung posts.

The law now requires any Vatican public official who learns of an allegation of abuse to report it to Vatican prosecutors "without delay".

Failure to do so can result in a fine of up to 5,000 euros (£4,300) or, in the case of a Vatican gendarme, up to six months of prison.

The legislation requires that victims be welcomed, listened to and provided with medical, psychological and legal assistance, and sets the statute of limitations at 20 years past the victim's 18th birthday.