Finding the actor and the motive behind a malicious hack is often a near-impossible feat of forensics.

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"China has the means, opportunity and motive to use telecommunications companies for malicious purposes, " the report says.

BBC: Huawei and ZTE pose security threat, warns US panel

"China has the means, opportunity and motive to use telecommunications companies for malicious purposes, " said the House Intelligence Committee's Dutch Ruppersberger, explaining to Reuters that both Huawei and ZTE has pinned their limited cooperation on restrictions from the local government.

ENGADGET: Reuters: White House finds no evidence of spying by Huawei, feels unsafe anyway (update: White House denies)