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The travel trade organisation, Abta, says a cyber attack on its website may have affected about 43,000 people.
About 1,000 files accessed may include personal identity information of individuals who have made a complaint about an Abta-registered travel agent. It says it is contacting those affected by the hack which happened on 27 February and has a dedicated helpline. It has also alerted the police and the Information Commissioner's Office (ICO), as part of the ICO's role is to help the public manage their personal data.
Abta chief executive Mark Tanzer said the organisation was not aware of any of the information being shared beyond the infiltrator.
ABTA is the UK's largest travel association, representing travel agents and tour operators who sell £32bn of holidays and other travel arrangements each year, according to its website. The organisation gives advice and guidance to holidaymakers, sets standards for travel firms and promotes responsible tourism in the UK and abroad.
It said the type of data which may have been accessed included:
Abta said the "vast majority" of the 43,000 people affected were those who had registered with email addresses and encrypted passwords or had filled in an online form with basic contact details.