Sri Lanka's new government said it is seeking to prosecute Kumaran Pathmanathan (known as "KP"), who was reported missing shortly after the defeat of Mahinda Rajapaksa at the presidential election.
KP, who was a former member of the LTTE, was apparently arrested by the Sri Lankan government in August 2009 before being welcomed by the then Defence Secretary Gotabhaya Rajapaksa.
"We heard he escaped through the airport's VIP lounge. We are investigating," the spokesperson for President Maithripala Sirisena, Rajitha Senaratne, was quoted by The Hindu as saying.
"The information we have is that he was taken out of the country. He had used the VIP lounge so there is no record of him leaving," Senaratne told DNA India.
"There are several people from the Rajapaksa regime who have already fled the country, but we want to tell them that we can use the international police and have them brought back to Sri Lanka," he added.