Ryanair has warned customers of an online scam that is targeting Facebook users.

In a post across its social media accounts, the airline pointed out that a supposed 'offer' of two free Ryanair tickets for the company's 35th anniversary was not all it seemed.

The Facebook link is posted with an image of a fake boarding pass, with the logo of Ryanair included.

Eagle-eyed users were quick to spot that the image had a few discrepancies.

The 'ticket' had a Qantas flight number and the seat number - 4K - would put the customer "on the wing" of a Ryanair jet, as one person pointed out.

There also appears to be frequent flyer details on the picture.

The firm said in its posts: "Please be aware of an online scam offering free Ryanair tickets. This is not an official promotion."

It follows a similar scam that affected rival airline Aer Lingus earlier this month.