Caught in the act, Silvio Berlusconi's arresting bunga bunga girls

They are not the type of photographs that usually emerge from gatherings hosted by heads of state.

But these images reveal what goes on behind closed doors at Silvio Berlusconi’s infamous ‘bunga bunga’ parties.

The pictures were discovered on laptops and cameras seized from dozens of female party guests as part of an investigation into claims that the Italian prime minister paid for sex with underage girls.

Arresting site: Showgirl Barbara Guerra poses in a tight police uniform and dangles a pair of handcuffs at one of Mr Berlusconi's parties at his home

Provocative: Two women prepare to kiss at the party, while dozens of other images capture the female guests in a series of poses

One picture shows TV showgirl Barbara Guerra, 32, wearing a tight-fitting police uniform and pouting as she dangles a pair of handcuffs.

Guerra has appeared on an Italian reality TV show and is the former girlfriend of Manchester City striker Mario Balotelli.

Investigation: Silvio Berlusconi is alleged to have bribed more than 30 women, including a 17-year-old, to have sex with him over two months

Another picture shows two unidentified women about to kiss, while further images capture other female party guests in provocative poses.

All were taken in the early hours of the morning at Berlusconi’s home in Arcore, near Milan.

Officials said Berlusconi had ‘ridiculed’ the police and ‘seriously offended’ nurses after it emerged women wore the uniforms as part of stripper acts at the parties.

The phrase ‘bunga bunga’ is said to refer to an after-dinner sex game. The risque photographs form part of the 20,000 page prosecution case against Berlusconi, who will appear in court next month accused of underage sex and abuse of office.

The 74-year-old is alleged to have given money and jewellery in exchange for sex with 17-year-old belly dancer Karima El Mahroug and 32 other women in the space of two months.

Paying for sex with anyone under 18 is illegal in Italy.

Berlusconi is also accused of using his power as prime minister to secure the release of Miss El Mahroug when she was arrested for theft last May.

But he has dismissed the allegations, joking that ‘33 women in two months is too many even for me’.