KP who was wanted on two Interpol warrants was arrested on Bangkok, said Sri Lankan military on Thursday, Aug 6.
"He has been arrested in Bangkok. That is all we know at the moment," military spokesman Brigadier Udaya Nanayakkara said.
However, the Thai authorities have not given any comment on this issue.
KP who was running the LTTE's arms and smuggling networks, was the first LTTE official to acknowledge the death of LTTE founder and leader Vellupillai Prabhakaran. Prabhakaran was killed in the last few days of the offensive launched by the Sir Lankan government against the group.
After the defeat of the leader, KP took over as the public leader after Sri Lanka declared victory against the militants on May 18 2009.