Another former LTTE member was arrested by the Terrorism Investigation Department, TamilWin reported on Thursday.
Ayyathurai Mohandas, known as Athavan Master, was arrested at Katunayaka airport, in connection to the suicide vest, discovered by the military earlier this year.
Mr Mohandas, who was the LTTE head of intelligence for Mannar and Vanni, surrendered to the military in May 2009 and after going through its controversial rehabilitation programme, was reportedly made to work for the intelligence services.
The TID claims he led the group responsible for the suicide vest and says he was attempting to escape to India when he was arrested.
His house was visited by intelligence officers earlier this year, however he was said to have gone into hiding by then.