Nokia New Zealand believes last week's 'F*** You' tweet was likely the work of a hacker, vowing to ramp up security as a result.

The offensive remark, sent out to the company's 970 New Zealand followers last, was followed by an immediate apology by the tech giant, who at the time claimed to be investigating the source.

Further to the company's initial response, a Nokia NZ spokesperson told TechDay:

“We take this extremely seriously and since the incident occurred our team has been investigating the matter to identify the source.

"At this stage we believe it was the likely result of a hacker and have subsequently increased our security protocol.

“We would like to again apologise to our Twitter followers in New Zealand and anyone offended by the post.

"We appreciate the ongoing support of our Twitter community in New Zealand and will be continuing our investigations into this matter.”