South Yorkshire holidaymakers are being warned about a new scam that has targeted popular travel firm Booking.com.
Users were reportedly sent WhatsApp and text messages claiming a security breach meant they needed to change their password.
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But the link gave hackers access to bookings and they then sent follow-up messages demanding full payment for holidays in advance with bogus bank details provided.
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The messages appeared genuine as they included personal data including names, addresses, phone numbers, dates and prices of bookings.
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Booking.com insists its systems were not compromised, but said hotels it works with on a separate portal were and customers will be compensated.