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has refused entry to passengers on a German cruise liner after some tested positive for , Moroccan media reported Wednesday.

The Mein Schiff Herz, owned by German tourism giant TUI and capable of carrying 1,900 passengers plus crew, had been meant to dock in Tangiers on the Gibraltar Straits on Tuesday morning on its way to Lisbon.

But Moroccan authorities barred passengers from disembarking due to "a report received by the Moroccan health authorities which indicates an increase in cases of Covid-19 infection among passengers," according to news website Le360.

Morocco on Tuesday raised its alert level for Covid-19 from green to orange after recorded cases spiked in several major cities.

Death and hospitalisation figures are relatively low but the rising caseload comes as Morocco's tourism operators - hit by two years of near-zero visitor numbers - desperately hope for a recovery.

Last month the kingdom scrapped rules that had obliged incoming travellers to present a negative PCR test.