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Cops are probing a “serious sexual assault” at the Central Initial Reception Center (ZEA) for refugees in the Hamburg, reports say.

The alarm was reportedly raised on Tuesday evening shortly after 7pm.

A girl, aged seven, is thought to be the victim of the alleged group sex attack, German newspaper BILD reported.

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Five Arabs have reportedly been accused of carrying out the alleged assault.

Public prosecutor Nana Frombach told BILD: "We have initiated a case against five persons.

“There had been no urgent need for action. The investigation will continue.”

Germany has been hit by a spate of sexual assaults since the migrant crisis erupted in 2015.

Chancellor Angela Merkel has come under fire for allowing millions of migrants and refugees to settle in the country.

Last month a young foreigner allegedly raped an OAP in Jena, Thuringia, as she left the house for work, according to reports.

In another incident in Germany, two migrants allegedly took turns to molest girls after trapping them in a swimming pool slide.