Key Khmer Rouge figures charged: leng Sary has repeatedly denied responsibility for any crimes. Cambodian authorities have arrested two leading figures from the notorious 1970s Khmer Rouge regime and charged them with crimes against humanity.

Former Foreign Minister leng Sary and his wife, lengThirith, were taken into custody in the capital, Phnom Penh.The pair, who deny any wrongdoing, are due to appear at a UN-backed genocide tribunal on Wednesday. The brutal Maoist regime, which ruled between 1975 and 1979, is blamed for more than one million deaths. A tribunal was established last year to bring the surviving leaders to the dock. "Today leng Sary and lengThirith have been arrested in execution of an arrest warrant... for crimes against humanity and war crimes as regards leng Sary and for crimes against humanity concerning lengThirith," a statement from the tribunal said.

Purge of intellectuals: Police surrounded the couple's Phnom Penh house early in die morning. They searched the house for three hours and then drove leng Sary and his wife to the tribunal in a convoy of vehicles. The couple, who have been living freely in the Cambodian capital for more than 10 years, were key members of the Khmer Rouge leadership. leng Sary was Pol Pot's brother-in-law - his wife's sister was married to the Khmer Rouge founder. His wife, lengThirith, was the Khmer Rouge's social affairs minister. As foreign minister, he was often the only point of contact between Cambodia's rulers and the outside world. He was responsible for convincing many educated Cambodians who had fled the Khmer Rouge to return to help rebuild the country. Many were then tortured and executed as part of the purge of intellectuals, some of them diplomats from his own office. Prosecutors for the tribunal have said there is evidence of leng Sary's participation in crimes,;. including planning, directing and co-ordinating forced labour and unlawful killings. leng Sary has repeatedly denied the charges.

In 1996 he became the first senior leader from the Maoist regime to defect and as a result was granted a royal pardon. But analysts say the validity of that agreement looks set to be tested with his arrest by the court. Ageing leaders leng Sary and lengThirith are the third and fourth people to be targeted by the tribunal. In September, Pol Pot's second-in command, 82-year-old Nuon Chea, was charged with war crimes and crimes against humanity.Two months before that, KangKek leu - or Duch - the head of the notoriousTuol Sleng prison, was charged with crimes against humanity. Their trials, before a team of Cambodian and international judges, are expected to start in 2008. Other top leaders are already dead. Pol Pot died in 1998 and Ta Mok - the regime's military commander and one of his most ruthless henchmen - died in July2006.

Abdul Momen

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