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Once HYDRA revealed their infiltration within S.H.I.E.L.D., HYDRA operatives started sieging and attacking every S.H.I.E.L.D. facility they had access to, including the Triskelion, the Hub and the S.H.I.E.L.D. Academy. The S.H.I.E.L.D. East African Headquarters were also attacked, and a HYDRA faction managed to take control of them.