In the first such trial for Luxembourg, a 29-year-old man was sentenced to three and a half years in prison, with half of the sentence suspended. The man’s partner, a 25-year-old woman, was jailed for two years, half of which was suspended.

The couple had downloaded, translated and disseminated thousands of messages online in support of the Islamic State.

As part of their sentence, they must also undergo a de-radicalisation programme.

The couple can appeal the sentence within 40 days, as can the prosecutor’s office, which had demanded higher sentences of four and a half years in prison for the male suspect and three years for his partner.

A Portuguese national who joined the terror organisation from his home in Luxembourg is reportedly still being held in a camp in Syria after being captured in March 2019.