ISIS jihadists are planning to attack Italian, French and Spanish beach resorts this summer by posing as refugees selling ice cream and T-shirts.

German and Italian authorities learned that the extremists plan to detonate suicide vests and bury bombs under lounge chairs on beaches, German newspaper Bild reported Tuesday.

The intelligence comes from a “credible source” in Africa who said the terrorists hatched “concrete plans” for the attacks on crowded beaches, the Mirror of the UK reported.

“It could be a whole new dimension of terror,” an official told Bild. “Holiday beaches cannot be protected.”

Italian and German intelligence officials believe the attacks may also involve the use of automatic weapons, and are being planned at resorts in southern France, Spain’s Costa del Sol and various Italian beaches, the site reported.

Seck Pouye, the police chief of the Senegalese town of Saly, said the terrorists from the Boko Haram Islamist group in Nigeria – an ISIS ally — planned to radicalize travelers between Senegal and Europe to carry out the attacks, according to the report.

“These people travel regularly to Italy and other places with visas and documents. They are not illegal because they are viewed as business people and traders. That is what makes them so dangerous,” Pouye said.

The report of a possible strike against European sunbathers came as Spanish authorities arrested a suspected ISIS collaborator from Morocco on Tuesday.

Police arrested the man in Palma de Mallorca, a city on the popular island of Mallorca where he had been living.

He allegedly used the internet to recruit jihadists and promote terror attacks in Europe, AFP reported.

“A police probe revealed that the accused had close contact with established terrorists involved with [ISIS] who are currently located in Syria,” Spanish police said in a statement using a synonym for ISIS.

In June 2015, ISIS madman Seifeddine Rezgui opened fire and slaughtered 38 tourists on a beach in Tunisia. He was later gunned down.

A source at Italy’s anti-terrorism department dismissed Bild’s report.