Laverty, who has won the Palme d’Or for his collaborations with director Ken Loach, was detained by officers in Edinburgh on Monday.

It is understood that Laverty faces a terrorism charge for wearing a T-shirt stating: “Genocide in Palestine time to take action”.

In other cases, the garment has been alleged to be in support of Palestine Action, a protest group proscribed as a terrorist organisation by the Labour Government in July.