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(Image: CEN/GETTY)

Police said the Afghan men allegedly snared the girls, aged 13 and 15, in a water-chute at Aquapark, in Oberhausen, west Germany, before sexually assaulting them.

One of the suspects allegedly stopped himself halfway down the slide so he could block the underage girls from passing.

His friend is then alleged to have entered the slide behind the girls to trap them.

During the alleged sex attack, police said the pair “put their hands on the girls' breasts and bottoms”.

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Both of men, aged 20 and 22, were arrested.

Despite being previously banned for causing trouble, the men were allowed to re-enter the swimming pool.

According to reports, the pair were banned for diving underwater and allegedly putting their hands on female bathers.

Initially the pool did not press charges.

When the men returned to the pool, the terrified girls told lifeguards about the alleged water slide sex ambush.

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Police spokesman Tom Litges said: “The girls travelled down the chute but were stopped halfway down by the first attacker, and were unable to go any further when suddenly the second attacker then came up behind them and the two men put their hands on the girls' breasts and bottoms.

“They said that the two men had been taking it in turns to assault each of them.”

AquaPark spokesman Alexander Hoefer said: “We will not tolerate anything like this in our swimming pools, and we are filing a criminal complaint against the two men.”

The incident is the latest alleged sex attack to rock Germany after Angela Merkel took in more than a million refugees from the Middle East.

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In a separate incident in the northern city of Bad Oldesloe, five underage girls were allegedly sexually assaulted by two asylum seekers, aged 23 and 24.

Police said the men were “southern-looking” and later confirmed them as refugees living in a nearby accommodation.

It comes after a swimming pool in Bornheim banned migrants from entering after a string of alleged sex attacks.

Last year migrants were handed instructional cartoons to stop them groping women at public swimming pools.