It comes amid rising US concern over security risks posed by products made by foreign technology firms.
Read moreNational security
The revelation has led to concern in the country, which has a territorial dispute with China.
Read moreOfficials say the ban, intended to protect "critical infrastructure", is a first for a sea port.
Read moreA senior intelligence employee under arrest is said to have had access to allies' information.
Read moreThe government is looking into Advent's £4bn takeover bid for British defence firm Cobham.
Read moreCameron Ortis, a civilian member of the RCMP, is charged with breach of security laws.
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