As Catalonia's President Carles Puigdemont went to the parliament to sign the declaration of independence from Spain, Spanish National Police announced that they had "elite officers" deployed around Catalonia, and prepared to execute a "raid" against Puigdemont."
Spain doesn't recognize Catalonia's referendum, and has accused Puigdemont and other leaders of "sedition" against the Spanish crown. Police suggested the arrest was planned if Puigdemont declared independence without some qualifier.
And qualify he did. Puigdemont "suspended" the declaration immediately, which so far appears to have gotten him out of being raided by Spanish National Police. He says the suspension is pending talks with Spain, however.