Spanish police said Friday they had identified around 800 British tourists suspected of having made fake food poisoning claims after going on holiday in the Balearic Islands to try to win compensation.
Police have listed 77 law firms allegedly used by the tourists to file their complaints as part of their investigation, a statement said.
The law firms "orchestrated a possible criminal network based on fake claims that have generated significant economic damage to the Balearic and Spanish tourism sector," it added.
The Balearic Islands -- which include Ibiza, Mallorca and Menorca -- saw a 700 percent rise in sickness claims from January 2016 until the end of September, with the overall cost of the claims worth four million pounds (4.5 million euros), police said.
Police said the problem of fake food poisoning claims was also affecting Spain's Canary Islands and the Levante region on the eastern Mediterranean coast, which includes the resort of Benidorm, popular with British tourists.
Hotels complain that British claims management companies openly tout for business in Spanish resorts, promising not to charge any fees if no eventual damages are paid out.
An ambulance emblazoned with the words "Claims Clinic" was last year pictured driving around Tenerife on Spain's Canary Islands, where more than one in three tourists is British.
Spanish tourism officials say the problem has arisen because British consumer law does not require claimants to produce any medical evidence of illness, and claims can be filed up to three years after a stay at a hotel.
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A Eurosceptic Tory MP has been accused of compiling a "hit list" of university professors who teach Brexit courses.
Chris Heaton-Harris has written to universities asking for names of such professors and the content of their lectures.
A lecturers' union said the letter had the "acrid whiff of McCarthyism" - and Tory peer Lord Patten called it "idiotic and offensive".
Mr Heaton-Harris said he believed in "open" debate on Brexit.
The government whip tweeted: "To be absolutely clear, I believe in free speech in our universities and in having an open and vigorous debate on Brexit."
Mr Heaton-Harris is a member of the pro-Brexit European Research Group of Conservative MPs.