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Tech companies like Twitter, now X, have been attacked via spear-phishing in the past.

Spear-phishing usually differs from typical phishing attacks by being more focused, as opposed to the quantity of targets a usual phishing message will be sent to.

Messages in spear-phishing can be more personalised, in an attempt to trick the victim into believing it is from a genuine contact.

Staff spotted a suspicious invitation to a meeting earlier on Friday and realised it was "spear-phishing" - which impersonates a trusted source.

The Harris camp said last week it had been the target of an unsuccessful spear-phishing attack.