MADRID (AP) — A Spanish Supreme Court probe into last year's attempt to secede Catalonia from Spain wraps up Friday with the judge expected to charge 28 regional politicians and separatist leaders with offenses that may include rebellion.

Judge Pablo Llarena has summoned lawyers, prosecutors, as well as six separatist politicians — an indication that he may order them jailed pending trial. They include Jordi Turull, a former minister of the ousted regional Cabinet who on Thursday failed in his bid to be elected as the region's new president, as well as a former speaker of the Catalan parliament and prominent members of the republican-left ERC party.

Four other accused are already in custody and six have fled overseas.

The semiautonomous region has been without a leader for nearly five months after central authorities took control following an illegal independence declaration.