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By Alexandra Gibbs, CNBC

A popular U.K. attractions operator has issued a profit warning ahead of its interim results this week, after a roller coaster incident at one of its theme parks.

Merlin Entertainments, owner of LEGOLAND, Madame Tussauds and London Eye, has said it expects earnings (before interest, tax, depreciation and amortization) could be as low as £40 million ($62 million) for its theme parks division, compared to £87 million ($135 million) in 2014, ahead of its first half results this Thursday.

The theme park operator attributes this dramatic loss in profits to a roller coaster crash at one of its theme parks, Alton Towers Resort, in June.

Related: Theme Parks Add to Thrills, Build Rides at Rapid Pace

On June 2, four people were seriously injured after two carriages collided on "The Smiler" roller coaster at Alton Towers, Staffordshire. Leah Washington, aged 17, had her leg amputated following the crash. The Smiler has since remained closed.

The Smiler roller coaster at Alton Towers in Staffordshire, England.Kirsty Wild

On top of the ride's closure, Alton Towers Resort remained shut for days following the incident, while other rides across two other theme parks were temporarily shut. Marketing for Merlin's theme parks was reduced significantly too.

"The magnitude of the financial impact is the result of both a significant reduction in revenue and the requirement to maintain an appropriate investment in customer service and marketing through peak season," Merlin Entertainments said in a statement, who added that it was taking action to re-engage with its customers.

The group expects that this financial hit on the theme parks' profitability may continue in 2016.