Singapore has rejected  President Maithripala Sirisena's allegation it was sheltering a former central bank chief wanted for fraud, saying Colombo failed to provide documents to support its extradition request, the AFP news agency reported. Sirisena on Monday accused Singapore of sheltering Arjuna Mahendran, one of his country's former central bank chiefs wanted in connection with a high-profile $74 million insider trading scam. Sirisena said he appealed to Prime Minister Lee Hsien Loong in January to return Mahendran, who is believed to be in Singapore, but claimed nothing had been done. A spokesperson for Singapore's Ministry of Foreign Affairs said authorities in the city-state have been cooperating with their Sri Lankan counterparts on the case since January. However, Sri Lanka's request to return Mahendran "lacked certain information required under Singapore’s extradition laws" and the city-state has requested Colombo to provide them, the spokesperson told AFP. "To date, Singapore has not yet received the requested supporting information and documents," the spokesperson said. "We look forward to receiving the requested information from Sri Lanka, so that we can consider the request further in accordance with our laws." Singapore can extradite fugitives to declared Commonwealth countries, which include Sri Lanka.