In addition, the FBI has offered "some technical assistance" in the investigation, said FBI spokesman Todd Lindgren in Cincinnati.

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For its part, GE said in a statement that it had sent a technical representative to Toronto for the investigation.

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The BBC understands no employee has been suspended from duty as the investigation does not relate to technical failings and the matter was raised externally.

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Last year, a report by the Air Accidents Investigation Branch (AAIB) found no technical reason for the crash, but said a technical fault could not be ruled out.

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Luis Corrons, technical director of Panda Labs, said during its investigation of Anonymous' attacks its analysts got talking to some of the activists via Internet Relay Chat (IRC).

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Power shortages have become a major issue in Pakistan, with the government ordering an investigation into a nation-wide power cut on Sunday blamed on a technical fault in a plant in south-western Balochistan province.

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This was most likely a technical error with the navigation system, but the exact nature of the failure is still under investigation.

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The carrier said in a statement that it saw "no evidence" that the technical outage was in any way related to Monday's deadly bombing in Boston that is under investigation as an act of terrorism.

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