British police have arrested a man as part of an investigation into a ransomware attack against Collins Aerospace that knocked check-in systems at airports offline and caused widespread travel disruption across Europe.

The National Crime Agency said the man, in his 40s, was arrested on Tuesday on suspicion of offences under the Computer Misuse Act and had since been released on conditional bail.

"Although this arrest is a positive step, the investigation into this incident is in its early stages and remains ongoing," NCA Deputy Director Paul Foster said on Wednesday.

It remained unclear which criminal group was behind last week's hack.

An NCA spokesperson declined to provide further details.

Ransomware gangs routinely publicise attacks and leak stolen data on dark web "leak sites" but

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