A man believed to be second in command of the November 17 terror group has been captured by Greek police.
Mr Pavlos Serifis, a telephone operator at an Athens children's hospital, is related to another two suspects already in custody.
Police sources said he is believed to have used the code name Nikitas, and may be a high-ranking member of November 17, possibly even the group's second-in-command.
Police believe he is a link between the terror group's founders and the hit squad that carried out most of its killings.
Twelve suspected November 17 members are in custody, including the alleged leader, Mr Alexandros Giotopoulos.
Police have in recent days been focusing their search, looking for the people believed to have started November 17 with Mr Giotopoulos in the mid-1970s.
The latest arrest brought to the forefront the close family ties among the majority suspects already in custody.
Mr Serifis is the cousin of bus driver Mr Thomas Serifis, who was arrested on Sunday, and a distant cousin of estate agent Mr Iraklis Kostaris, who has been charged with participating in four attempted murders.
Another three in custody are brothers, the sons of a Greek Orthodox priest.
Police contend part of the reason they were unable to infiltrate the group for 27 years were the strong family and friendship ties between its members. Once caught, the ties seem to worked against the group, providing police with the means to make quick arrests.
PA