Chinese firms pose spy threat, says US panel
8 October 2012 Last updated at 17:39 BST
Chinese telecom firms Huawei and ZTE pose a security threat to the US, a congressional panel has warned after an investigation into the two companies.
The panel says the firms failed to allay fears about their association with China's government and military.
The firms - among the world's biggest makers of networking equipment - denied the accusations in front of the panel.
John Sudworth reports.