Four men have been charged with terrorist activities linked to the banned Tamil Tigers.
The men who were arrested in sweeps in Swindon, London and Newton, in Powys will appear before a London magistrates.
The four men are:
Arunachalam Chrishanthakumar, also known as AC Shanthan, 51, of Norbury, south London
Jegatheswaran Muraleetharan, also known as Muralee Tharan, 46, of Newtown
Jeyatheswaran Vythyatharan, also known as Vithy Tharan, 39, of Newtown
Murugesu Jegatheeswaran, also known as M Jegan, 33, of Mitcham, south London
They are accused of possessing laptops, antennas and high-powered magnets to be used for terrorist purposes.
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The Tigers have fought for a generation in Sri Lanka, to gain an independent state for the Tamil minority.
Major funding
A Scotland Yard spokesman said earlier that the arrests of the men, aged 33, 39, 46 and 51, were part of a long-term investigation into support for overseas terrorism.
The men are charged with conspiring to receive equipment for terrorist purposes between January 2003 and December 2006.
The equipment they are accused of possessing also included head torches, radios and navigation systems.
A fifth man has already been charged in connection with the investigation, Scotland Yard said.
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