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In page Yekatit 12:

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The final reprisal struck in May. Investigators found that Abraha and Mogus had stayed a while at Debra Libanos, and slight circumstantial evidence suggested that the monks had foreknowledge of their plans. Graziani, mindful of his misadventure at Jijiga, believed that they were complicit and on 19 May, cabled the local commander: "Therefore execute summarily all monks without distinction including the Vice-Prior." The following day, the feast day of their patron saint Tekle Haymanot, according to the records of the Italian fascists, 297 monks plus 23 laymen were shot, the entire population of the monastery;[1] other sources estimate the death toll at 1,500 to 2,000.[citation needed]