LONDON — UK's Home Office said border control systems are operational after an outage that it deemed was not a cyber attack led to lengthy queues and chaotic scenes at airports nationwide.

"At no point was border security compromised and there is no indication of malicious cyber activity", the Home Office said in an emailed statement early on Wednesday (May 8).

UK's biggest airport, Heathrow, said all of its border control systems were running as usual and that it expected no issues when operations re-start in the morning. London Stansted Airport also confirmed the outage had been resolved.

Long queues built up at British airports on Tuesday night after the Border Force suffered a nationwide technical issue. One traveller described border officials manually processing passport holders.

UK's biggest airports, including Heathrow, Stanstead and London Gatwick in southern England, Manchester in northern England, and Edinburgh in Scotland, earlier said they were aware of a nationwide problem and that staff were working with Border Force officials to resolve it.

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