Deidara was fighting Sasuke who was trying to get to Itachi. Deidara had had enough of being beaten by Uchihas and turned himself into a C0 clay bomb by stuffing C0 chakra into the mouth on his chest and blowing up, committing suicide while exclaiming "ART IS A BANG!". Unfortunately, he was not successful, as Sasuke escaped and lived to defeat Itachi.
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