LUSAKA (Reuters) - The Zambian government has accused detained former president Kenneth Kaunda and two other politicians of paying junior army officers 400,000 kwacha ($270) to carry out a coup attempt last October. Legal papers setting out the grounds of Kaunda`s detention were served on him on Saturday, saying he had also undertaken to pay the soldiers an additional 20 million kwacha ($13,300) after the coup, which was squashed by troops loyal to President Frederick Chiluba. Kaunda, 73, was detained on Christmas Day and held in prison for nearly a week, before being placed under house arrest and banned from politics. Junior army officers led by Lungu seized the state broadcaster on October 28 and announced they had overthrown the government. However, government officers took control again five hours later. The grounds of detention allege that Kaunda plotted the coup with two other opposition politicians. According to the papers, the soldiers were supposed to rule for three months after the coup and then hand power to the opposition leaders. Kaunda has denied any involvement in the failed coup and has said he is being held because of his fight against government corruption and drug trafficking. The former president is scheduled to again appear in court on Monday to challenge his detention.