Which act by Pope Boniface led to his capture at the papal summer palace in Anagni in September 1303?

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Pope Boniface's conflict with King Philip IV of France came to a head when Boniface issued a papal bull called Unam Sanctam, which asserted the pope's supremacy over temporal affairs and threatened to excommunicate Philip if he did not submit to papal authority. This angered Philip, who sent his agents to arrest Boniface at his summer palace in Anagni.

Which Act by Pope Boniface Led to His Capture at the Papal