EasyJet Plc said there are no risks to its passengers after the Sun newspaper reported Arabic graffiti was found on panels covering the fuel tanks of four of its planes in France.

The U.K. airline put its staff on high alert, while U.K. police said they were worried by the discovery, the Sun reported. EasyJet said it has assessed the issue and is "entirely satisfied it is nothing more than graffiti," commenting in a statement on Saturday,

“EasyJet takes very seriously any security related issue and would not operate a flight unless we are entirely satisfied it is completely safe to do so," the company said. “This is not considered to be a security issue by both us and the authorities who share our assessment that it poses no risk whatsoever."

Europe’s travel sector faces its greatest challenge for years following this month’s terrorist attacks in Paris, which came two weeks after the downing of a passenger jet over Egypt that Russian President Vladimir Putin said was caused by a bomb. EasyJet has 20 percent of its capacity in France and also serves Egypt.

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