Meanwhile, a senior US congressman has linked the plot to an al-Qaeda leader killed in Yemen on Sunday.

BBC: Al-Qaeda Yemen plane bomb plot foiled by 'insider'

The riverside plot is linked to Moat Brae House in Dumfries where the author played as a child.

BBC: Dumfries Peter Pan house project secures land boost

One of these - Ibrahim Magag - has been on the run since December although the home secretary has said she does not believe the 28-year old's disappearance was linked to any current terror plot.

BBC: TPims: Terror watchdog urges higher standard of proof

Two men - one a cabinet member and one said to be linked to the ringleader of a previous plot - were arrested on Sunday, a BBC reporter in Benin said.

BBC: Benin foils 'coup attempt' against President Yayi

French media have linked Daoudi with seven people arrested in France on September 21 with an alleged plot to attack American interests in France, including the U.S. Embassy in Paris.

CNN: Man arrested at UK airport