The Omagh Enterprise Centre is a hub for Project Kelvin, a telecommunications cable linking Northern Ireland to the USA and Europe.

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News of the outage came as another cable - the Main One cable linking Europe with Western Africa - was switched on.

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Technicians on the roof, examining a microwave link to a remote transmitter, also found a cable linking to a second alleged pirate station, that while not transmitting, contained radio equipment which officials also seized.

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